Engine hot ac off what does that mean

"engine overheating ac turned off" notification on my 2010 silverado 1 Answer. I have a 2010 silverado crew cab, the other night while driving around town I got the notification "engine hot a/c turned off" so far diagnostics says its not the TSTAT, getting a code for a crank ...

My car is not blowing hot air how ever the seat heater does get hot. I check these 2 tubes and it's cold to the touch (I touched the exposed tubber part.)Feb 6, 2015 · I would recommend to verify that the coolant level is full, if low add and get to a shop that has the proper diagnostic tools to scan the engine controller and determine the problem. Some possibilities could be, leak in system and low coolant causing overheating, fan inoperative, bad temp sensor reporting false data, bad connection or wiring ... No hot water valve is needed because in cool mode the door closes off airflow through the heater core. When the air passes through the evaporator and heater core as in example 1 above, a hot water valve is used to shut off the hot water to the heater core. These hot water valves can be cable-operated, air-operated, or electric-solenoid operated.When your engine thinks it is hot. Does your heater blow hot air. If it does not then you are low on coolant. 2 things I did was flush the engine and radiator and run cleaner thru it. If you have scale buildup in the head cooling passages it would mean real problems. Also, I cleaned the radiator externally too.For a 2.4 litre engine, where the pressure cap is that is the thermostat housing..if you try to remove the pressure cap (in cold temperature only) you will see the thermostat..A damaged thermostat ...Check refrigerant leaks. Step 1. Check temperature fluctuations: If you are getting warm air when your AC system is engaged, chances are you have a lousy or failing ac compressor. If the AC is still working, check if the AC temp fluctuates; if it does, it's an indication of a failing ac compressor. Step 2.Three days ago while the AC was on, the engine temp guage went 3/4 of the way to the red line. I shut the AC off and the guage went back to half way where it usually resides and stayed there. On my way home from work today, I was driving in my usual lead-footed manor and "Engine Hot - AC Off" appeared on the DIC. The air wasn't even on.Asked by Guru9ZM6RP Jan 24, 2021 at 01:53 PM about the 2010 Chevrolet Impala LS FWD. because my car had been parked outside, covered in snow for 3 days prior. "Engine Hot Turn A/C OFF". I came back parked it and 3 days later when I. turned the car on, same warning so I again turned it off. Came back 4 days.

The most common reasons why your lower radiator hose is cold are a faulty thermostat, a bad water pump, or a low coolant level. It can also be caused by airlocks or a clogged coolant system. Here is a more detailed list of the six most common causes of a cold lower radiator hose: 1. Faulty thermostat. This is the most common problem when it ...An engine misfire is an event that occurs when one or more of the engine’s cylinders fail to ignite the air/fuel mixture during the combustion cycle. This can lead to a variety of engine performance issues and can even lead to serious engine damage if left untreated. For complete cylinder combustion to occur, the engine needs three important ...What Does It Mean When Your Car Says "Engine Hot AC Off"? Engine overheating is not a "strange" term for many drivers and we are sure that we all know about the consequences of this issue for your car. When the engine burns fuel to generate energy, it generates a large amount of excess heat.Usually it sets a P0128 code which means thermostat is taking too long to open so vehicle says shut AC off and that it is running hot jut to be safe since it doesn't know. My goal is to provide 5 star service so please let me know if you have questions, thanks. The coolant temp sensor is about a $40 part and a half hour to replace.Does the Trailer Brake System Have a Fuse? Yes, a trailer brake system uses a fuse as a safety device. If there is a malfunction in the system, the first component that will give way is the fuse so the entire system will not be compromised. Typically, the rating of the fuse is 30 amps. You will find this fuse inside the fuse box in the engine bay.What Does Engine Hot AC Off Mean? Can I Still Drive When "Engine Hot AC Off" Is On? What Leads To The Engine Hot AC Off? How To Fix It? Coolant Level; AC Compressor Stopped Working; Fail Radiator Fan; Coolant Temperature Sensor (ECT) Error; Blown Head Gasket; Tips To Prevent AC Off Due To High Engine Temp. Schedule Regular Maintenance ServicesApr 21, 2019 ... ... Engine is hot and AC Turned Off? You may also have an illuminated check engine light and stored code P0128 as well as no operation of the ...

If you’re a car enthusiast or in the market for a new engine, you may have come across the term “rebuilt Chevrolet 350 engine.” But what exactly does that mean? In this ultimate gu...For a 2.4 litre engine, where the pressure cap is that is the thermostat housing..if you try to remove the pressure cap (in cold temperature only) you will see the thermostat..A damaged thermostat ...The A/C Off Due to High Engine Temp message can appear on your driver information center (DIC). When the DIC displays this alert, it means that the coolant in the engine …I am working on a 2013 1.4L Cruze and it is doing the whole "A/C off due to high engine temp". After that message the temp gauge continues to rise and says "engine overheated idle engine". I started …A code P0128 may mean that one or more of the following has happened: Low engine coolant level. Leaking or stuck open thermostat. Faulty cooling fan (running too much) Faulty coolant temperature (ECT) sensor. Faulty intake air temperature (IAT) sensor. Possible Solutions. Past experience indicates that the most likely solution is to replace …

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The cooling fan relay is an electromagnetic switch that controls the power supply to the engine's cooling fans. Without it, the cooling fan won't work. Without the radiator fan, your engine can run hot and be at risk of overheating. A faulty relay can be caused by a bad relay control module, ants in the relay, or an electrical short.Apr 14, 2019 · The code that gets thrown out most often after the issue happens is BA222. It turns out the code is a GM specific code for "system anomaly". Basically, there are two temp sensors, one for the gauge and one for the ECM. After the truck is running for a short time while the outdoor air temp is very mild (in the upper 50s or lower 60s) the ECM ... First is the engine is actually running hot. This would show up on your temp gauge as the engine would be running hotter then 240deg. If the gauge or display shows normal engine temp then you may have a bad thermostat. The second problem is the thermostat, its performance is checked by the engine computer.Berger 93 said: Well yesterday while doing some Christmas shopping with the wife the DIC popped up the message . . The temperature gauge in the cluster would not move, and the radiator fans are running on high. Made three - four stops and it came up every time after a few mins of driving. Was not hot . . the engine oil was around 163 degrees . .

What "Does Engine Hot, AC Off" Mean? Your Chevy Impala displays the "Engine Hot, AC off" alert when the electric cooling fan fails. The car engine overheats when the cooling fan and other cooling system parts malfunction. The engine requires enough power to run the AC and other systems. When the fan fails, the AC goes off to reduce the load on ...2009 Express 1500, Engine Hot, AC Off message. The engine is NOT hot and the temp gauge is "off", at 100. I know the engine is running fine, my mechanic checked it. This has happened in the past and t ... A/C disabled to protect engine - what does this mean. ...1. Belt Tensioner. A belt tensioner is the most common cause of air conditioner rattling. Fortunately, it's fairly easy to replace. The tensioner is a part at the front of your engine that ensures the serpentine belt that drives the air conditioner pulley stays as tight as possible at all times. Eventually, the spring in the tensioner can ...A Leak in the A/C System. A small refrigerant leak is the most common reason a car's A/C gradually loses its cool. A leak is typically caused by a mixture of moisture and refrigerant that, when combined, creates a corrosive acid that eats away at seals, valves, and hoses in the A/C system. A leak in your A/C system could be causing the unit to ...What "Does Engine Hot, AC Off" Mean? Your Chevy Impala displays the "Engine Hot, AC off" alert when the electric cooling fan fails. The car engine …Mine does and if i do not let it get warm, and then go cruising at 45-70 it will appear. I suggest starting it, turning off the a/c and letting it sit for a good 5-10 minutes, and then put it in 3rd gear to keep the rpms up to get her warm. And i guarantee it will never do it again if it is warmed up first.Request Appointment. Warning light reading ENGINE HOT A/C OFF. 1 person has answered this. 08 denali xl engine stalls after drive approx. hour cranks but wont fire. 1 person has answered this. Just replaced both head gaskets about a week ago car has been running fine got in my car last night went about a mile down the road in the warning ...What Does AC Off Due To High Engine Temp Mean? A car’s AC is off due to a high engine temperature symbol when the PCM detects an excessively heat engine or malfunction in the cooling fan. The car’s computer system turns off the AC to reduce the engine’s pressure and prevent it from overheating. ... But a too-hot engine can prevent …Flush and replace the coolant as recommended by the vehicle manufacturer. 2. Thermostat Maintenance. Ensure that the thermostat is working correctly. Replace it if it’s malfunctioning to guarantee appropriate coolant flow. 3. Radiator Care. Clean the radiator fins of debris, leaves, or dirt that can block airflow.Understanding the purpose of the AC off feature is essential. When the engine is running hot, the heat produced can put additional strain on the engine. By turning off the AC, the engine can divert more power towards cooling itself, ultimately preventing overheating. This feature ensures that the engine temperature remains within safe limits ...A code P0128 may mean that one or more of the following has happened: Low engine coolant level Leaking or stuck open thermostat (likely) Faulty cooling fan (running too much) Faulty coolant temperature (ECT) sensor. Faulty intake air temperature (IAT) sensor. 1. Make sure you have enough coolant.

What is wrong with my 2008 Pontiac torrent showing hot for a minute then you can step in the gas right quick and it fall back down fast to normals and it shows in the dash motor shout down power and ac shout down what is wrong. 13 people found this helpful. Mark helpful. 20. Suzanne answered 3 years ago.

Chevy Mechanic: Dan. This usually means the thermostat has failed. When thermostat has failed the computer goes into fail safe mode, forces ac off, and temp gauge stops working. You should start by having diagnostic codes checked, if you are getting code P0128 then thermostat needs to be replaced.Idle the engine. If coolant starts to flow right away, it means the thermostat is stuck open. When coolant does not start flowing, wait for the engine to warm up. The coolant should start to flow in ten to twenty minutes. The thermostat is stuck closed if the coolant does not flow, but the temperature gauge rises.Basically the engine takes too long to reach operating temperature. When this occurs, the ecm will set a po128 fault code, disable the a/c and default the temperature gauge to zero. Clearing the fault code will re-enable the gauge and the a/c system and replacing the thermostat will prevent it from re-occurring.The AC's compressor is run off the engine, and the extra load could be what's causing it to run hotter. If you find that the air conditioner always raises the engine's temperature, you may have a larger mechanical issue that will need to be repaired. Hit the Fan. This part may not be comfortable, but it will certainly help your vehicle ...Some of the most common causes of an overheating engine include: Low oil levels. Cooling system leaks or clogged coolant hoses. Faulty water pump. Damaged or blown head gaskets or warped cylinder heads. Radiator failure or damaged radiator cap. Faulty thermostat.Feb 7, 2023 · How to Reset Engine Hot Ac off. If your engine hot ac light is on, it means that your car’s engine is overheating. To reset the light, you’ll need to cool down the engine and then restart the car. 1. Park your car in a safe place and turn off the engine. Let the car sit until the engine has cooled down completely. Flush and replace the coolant as recommended by the vehicle manufacturer. 2. Thermostat Maintenance. Ensure that the thermostat is working correctly. Replace it if it’s malfunctioning to guarantee appropriate coolant flow. 3. Radiator Care. Clean the radiator fins of debris, leaves, or dirt that can block airflow.Ask Your Own Chevy Question. but its not on. Chevy Mechanic: david craig. ok. well fill the coolant. clear the messages, drive the vehicle. if it comes back again, replace the sensor i mentioned above. Ask Your Own Chevy Question. Ok, I will go fill in once day light hits here. In about an hour.2687 posts · Joined 2009. #3 · Aug 29, 2012. X2!! 2006 Black Raven STS-V. Spectre Cold Air Intake, EBC Slotted & Dimpled Rotors, Hawk Performance Brake Pads, Energy Suspension Rear Bushings & Poly Bushings Front Bushings, Custom Magnaflow Exhaust, B&G Lowering Springs, NGK/AFX Wideband O2, Frozen Boost Type 101 HX & Flex-A-Lite 45321 HX, KDI ...2 posts · Joined 2021. #1 · Jun 23, 2021. 2015 Chevrolet Impala LTZ 3.6l. ~112k miles. Ok, beginning of problems: This is my wifes car and we have had no issues up until around 2 months ago. One morning while she was headed to work she got the famous "AC Off Due to High Engine Temp" and the temperature gage goes straight to C and stays there.

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1. Check Engine Light Turns On. An illuminated Check Engine Light is one possible symptom of a bad ECM. The Check Engine Light usually illuminates when the computer detects a problem with any of its sensors or circuits. There are cases, however, where the ECM illuminates a Check Engine Light mistakenly, or when there is no issue present.2007 PONTIAC TORRENT. 145,000 MILES. So my Pontiac torrent has had this engine hot/ac off since I have this vehicle. I have replaced the thermostat, the temperature control sensor on the block several times, I have had the radiator flushed, and currently on my third dash /cluster, replace wiring harness. There is no over heating, no oil in my ...Feb 23, 2016 · My 2011 buick sounded hot engine ac off alarm yesterday while 2 miles from home. I immediately stopped and seems less coolant in reservoir so added some coolant. No other warning lights came on. Then I drove back to home and within 1 mile I can see the heat gauge on dashboard raised all the way up to max. Checking the radiator hose and engine ... When talking about electrical current, AC stands for “alternating current” and DC stands for “direct current.” Alternating current is the type of current that comes from a power pl...Cause. This condition may be caused by a logic lock-up in the HVAC control module. Correction. Technicians are to reprogram the HVAC control module with an updated software calibration. The new calibration was released beginning with TIS satellite data update version 6.5 which was made available on June 12, 2006.A. Recap of the AC off due to high engine temp issue. The AC off due to high engine temp message is a common problem faced by Chevy Malibu owners. It serves as a warning sign of potential engine overheating and triggers the AC system's automatic shutdown as a protective measure. B. Importance of addressing the underlying causes promptlySep 23, 2021 · 2445 posts · Joined 2011. #1 · Sep 23, 2021. Was driving to work today and got Engine Hot AC Off message and gauge was all the way on the low side. Lucky I wasn't far from home so I took her home and drove the DD to work. Checked under the hood and nothing was overheating or hot and fluid was normal level. I was logging with HP Tuners and ... What does Engine Hot AC off mean? Your car’s cooling system may be seriously compromised if you see the “Engine Hot AC Off” warning light. A blinking Engine Hot light indicates that the onboard computer is turning off any equipment that places an extra load on the engine. The air conditioning system is one such example of such equipment. A code P0128 may mean that one or more of the following has happened: Low engine coolant level. Leaking or stuck open thermostat. Faulty cooling fan (running too much) Faulty coolant temperature (ECT) sensor. Faulty intake air temperature (IAT) sensor. Possible Solutions. Past experience indicates that the most likely solution is to replace the ...What Does Engine Hot Ac Off Mean? Imagine that while driving down the interstate, your car suddenly flashes the warning, “Engine Hot AC Off.” It can be very frustrating for you! Your car’s dashboard displays the warning “Engine Hot AC Off” if the engine’s temperature has increased to the point where it needs to be fixed right away ...The PCM looks at the initial start up values of the air temp sensor and the coolant temp sensor and if it has been over a set time period (about 8 hours), they are usually extremely close. So if the coolant sensor is way off and does not make sense (too high at a startup) a code is set. I replaced the thermostat and coolant temp sensor yesterday. ….

This video is brought to you by @Haymaker140Follow I'm for more how to tutorials in the future!You will most likely find a p0128 set. This code means the thermostat is stuck open and the computer sets this code. When this code sets, the engine computer turns on the engine hot light even though the engine is running at a normal temp. This is done to help protect the engine since the engine computer detects a problem with the cooling system.AC Off warning. Monday night, the "AC OFF" light came on the dash. I did some research and know that it is probably the thermostat, a sensor, the water pump, or an electrical problem. I never had any other lights come on, like the check engine, or an "Engine HOT" warning. In fact the temp gauge went all the way down to cold.303 Answers. SOURCE: 2000 chevy express 1500 van having starting issues. Start with fuel system. Listen for fuel pump humm at fuel tank No humm check wiring to pump for power. Then check for spark at plugs and wires. Remove wire from coil and hold near engine and see arch when you crank. No arch.Here’s what should you do if your Chevy Cruze AC turns off due to overheating: 1. Turn Off The Engine And Pull Over To A Safe Spot. Wait until your Chevy has cooled or the temperature gauge has changed from hot to cold before opening the hood. 2. Check The Coolant Level (Also Known As Antifreeze) In The Radiator.The AC is off due to the high engine temperature symbol means that the PCM (Powertrain Control Module) detects too much heat in your engine, or the electric cooling fan has stopped working. The A/C is turned off automatically to prevent overheating. The PMC is used to monitor your engine’s temperature, and if it detects an …What does Engine Hot AC Off mean Impala? This dashboard light indicates a malfunctioning cooling fan within the system, which causes the engine to run hot or become overheated (which explains the term "Engine Hot").. Under such circumstances, the AC consumes too much energy beyond the engine's generative capability, forcing it to shut off on its own to reduce the engine's load and ...In this case the ECM program will disable A/C clutch engagement and turn the mentioned light "on". The ECM probably also turns this light 'on' when you go to WOT. A mechanic should check what the temperature is at the sensor location. It may be a problem with the cooling system or just a bad sensor. Engine hot ac off what does that mean, 73K views 6 years ago. In this video I describe how to fix the dreaded “Engine hot turn AC off” code that so many Impala owners have been lamenting over …, 04/28/2024. If your engine gets hot without the AC on, it may signal issues like a faulty ECT sensor, a malfunctioning radiator fan, low coolant, poor radiator airflow, or a defective coolant sensor. Watch for fast temperature gauge rises, abnormal coolant levels, fan issues, reduced cooling, and possible engine damage., This occurs when the temp sensor is not immersed and the thermistor has no output. Most mechanics tend to replace the sensor, wiring, plugs and then realize that the actual problem is an air pocket. Pressure test the cooling system and check for leaks. I have been receiving an 'a/c off' display on my 2008 h3 adventure., When it gets hot, that can spell a whole lot of trouble. Not to mention, overheating is one of the top causes of death for a vehicle’s engine. In fact, your vehicle will give off a warning saying “Engine Hot, AC Off”. It is important to ensure that your engine stays alive for as long as possible and will not die a horrible early death due ..., Yes open. Causing the engine to actually run too cool which can set a fault code (p0128) and disable the a/c system. First off check the temperature gauge and see if it is high or low when this occurs. Let me know what you see when you check the coolant level as well. Again the most probable cause would be a leaking water pump (coolant level ..., IF the engine control module *receives a signal* that an engine overheating situation is present (whether it’s actually overheating or not) A/C is switched off by default. Choose among the best repair shops in the country - those that meet only the highest standards. Out of the blue my message screen reads "engine hot a/c turned …, If you have it scanned for codes you may find a P0128. When this code is set the Engine Control Module (ECM) Disables the A/C and displays engine is hot. The most common problem is a faulty thermostat. The engine is not reaching operating temperature., How to Reset Engine Hot Ac off. If your engine hot ac light is on, it means that your car's engine is overheating. To reset the light, you'll need to cool down the engine and then restart the car. 1. Park your car in a safe place and turn off the engine. Let the car sit until the engine has cooled down completely., Not any ping ,knock, leaks etc. Then a few days ago my engine hot turn a/c off displayed and my temp gauge is staying on C.. the car wasn't hot, antifreeze is good at at correct level. The a/c wasn't on in the first place because it was 25 degrees out. Then my amber engine light pops on. I'm about to go disconnect the battery., Conclusion. The final say is there can be many reasons for Engine hot AC off Impala but not overheating. Some of them include low coolant level, radiator fan not working, or faulty compressor. You should always check your coolant level, keep a tab on temperature gauges, and avoid long sun exposures., Feb 2, 2018 ... I got the "Engine Hot A/C Off" message on my Impala. This is how I fixed it! #EngineHotACOff #ImpalaEngineHotACOff #ImpalaThermostat., My fan comes on as soon as I start my car, even tho it's cold outside. It stays on for about 30 seconds after I shut it off. Temp gauge stopped working. Cars saying engine hot ac off. Changed the temp sensor but I did break off a piece of the connector. Connector still went right in to the new sensor tho. Do you think I need a new connector? I ..., P0480 is for the electrical circuit of the cooling fan relay. The cooling fan relay is about the size of a deck of cards only a little taller. It's mounted to the metal bumper support under the bumper cover on the left side, near the headlight. It has aluminum cooling "towers" on top to dissipate heat., 1. Radiator Blockage Causing Overheating. 2. Malfunctioning Radiator Fan Failing to Circulate Air Through Radiator Core. 3. Low Engine Coolant Level Due to Potential External Leakage or Internal Head Gasket Blow by. 4. Stuck Open or Closed Thermostat Hindering Efficient Coolant Circulation Parameter Regulation. 5., I have a 2006 chevy impala v6 3.5l ls and the display says engine hot a c off and the temp gauge doesnt move from off position. checked the fluid and is full . hoses dont even fell that hot. any ideas … read more, Turn off the power to your AC unit from the circuit breaker. Remove the dust cover of your wall unit and place it aside. Open the front panel of your AC wall unit and remove the air filters. Unscrew the outer casing of the AC wall unit and remove it to reveal the inner compartment and electrical unit., The automatic shutting off of AC was the first in a series of overheat warnings and is followed by the DIC message warning of "engine overheated, idle engine" and "engine overheated, turn engine off". The "idle engine" message is pretty much worthless when there is a major engine or cooling system problem and only is useful if the engine were ..., 5 posts · Joined 2020. #5 · Aug 19, 2020. I just had similar issue with my 2015 traverse. It was the coolant sensor but it gave an engine code that they were able to read. About $150 to replace at local garage, part was $47. I didn't have an engine hot message, just noticed my fan was running after I turned off the car and the ac was …, When it comes to staying cool during the hot summer months, having a reliable air conditioning unit is essential. One brand that has been gaining popularity in recent years is Chil..., Remove the radiator cap when the engine is cool to check the fluid level. You may have to change your engine thermostat if the fluid level is full. Then, after a pre-determined number of engine start / warm-up / stop cycles, the code will clear itself and turn off the check engine light if the engine warms-up in the correct time frame., Engine Hot AC Off - What Does It Mean and What Causes It? By Austin Parsons December 12, 2022 December 21, 2023. One of the most common warning lights associated with an overheating engine is the "Engine Hot AC Off" message, which can catch unsuspecting drivers off guard. This message is most common on GM cars with digital dash displays ..., Next, inspect the engine oil. The oil should be neither too dirty nor overly diluted. If the compressed oil is unable to lubricate the engine, it’s bound to overheat. So check the oil levels and the viscosity. Top it off or replace if necessary, depending on what the state of the oil is., Inspect the electrical connector to the sensor for any loose, broken or damaged wires. If the visual inspection checks ok, replacing the ECT Sensor should solve the problem. It's located on the driver's side, rear of the engine (#1 in image below) Ask Your Own Pontiac Question. Thanks Ron!, Feb 22, 2019 · I have 2009 Chevrolet equinox it says engine hot ac off what do tha mean. 52 people found this helpful. repaire coolent thermostae. 8 people found this helpful. I replace the thermostat the old one was bad but it still says engine hot AC off with the engine light on. 28 people found this helpful. , Engine hot A/C off light on, temperature gauge drops to zero, AC does not blow cold. I have replaced the thermostat two times drive approximately two hundred miles light comes back on and throwing same code. Replaced ECT sensor drove approximately fifty miles same thing! Hate to keep throwing parts please advise., Switch off and unplug your AC. Open the front lid and remove the filter by gently pushing it inwards. Clean the air filter by rinsing it under running water, also you can gently brush it to remove debris., What does that mean? This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to all 1996-newer vehicles (Ford, Hyundai, Kia, Mazda, Mercedes-Benz, etc.). Although generic, the specific repair steps may vary depending on make/model. ... Engine hot/ AC OFF 2008 Chevy Impala P0116 Hi,i hope you can help. I own ..., That "engine hot AC off" happens to me now and again, but it's always after I've driven it for a bit, let it sit, then start it up and go right away without it really warming back up. The truck is warm, the engine is warm, but the temp gauge hasn't moved. All I have to do to fix it is clear the code with my tuner and the temp gauge jumps up to ..., When i first start my truck and know the engine is not hot. "Engine hot ac shut off" appears. Whats going on with this? Report. 2007 Chevrolet Silverado 1500 38,000 mi, Visitor. Engine hot a/c turned off. Replaced all kinds of stuff cuz engine not hot. Replaced thermostat, fixed problem. Report., 1) Faulty Engine Control Unit. Although rare, the Engine Control Module (ECM) may act up and cause false temperature gauge readings. If the ECM can't detect a change in the voltage signal from the sensors due to damage, it can't effectively control the dashboard temperature gauge or the radiator fan., May 17, 2017 · A code P0128 may mean that one or more of the following has happened: Low engine coolant level. Leaking or stuck open thermostat. Faulty cooling fan (running too much) Faulty coolant temperature (ECT) sensor. Faulty intake air temperature (IAT) sensor. Possible Solutions. Past experience indicates that the most likely solution is to replace the ... , What Does It Mean When the Engine Is Hot While the AC Is Off? | The Motor Guy. 4 days ago. 04/28/2024. If your engine gets hot without the AC on, it may signal issues like a faulty ECT sensor, a malfunctioning radiator fan, low coolant, poor radiator airflow, or a defective coolant sensor., Engine Hot AC Off - What Does It Mean and What Causes It? By Austin Parsons December 12, 2022 December 21, 2023. One of the most common warning lights associated with an overheating engine is the "Engine Hot AC Off" message, which can catch unsuspecting drivers off guard. This message is most common on GM cars with digital dash displays ...