Engine hot ac off but temp gauge reads cold. whats going on? We would like to show you ...
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Engine hot ac off but temp gauge reads cold. whats going on? We would like to show you a description here but the site won’t allow us. It seems to reset itself after a while. Also in those cases, users reported an indicator message something to the effect of "AC Off Due To Engine Temperature". As a failsafe since it has no idea what the actual coolant temp is, the PCM commands both fans on high speed and keeps the A/C off to prevent extra heat from the condenser. When the sensor fails it cuts off the a/c to reduce the load on the engine and since the sensor is faulty it doesn't read anything and cause the gauge to sit at zero. Once operating temp is reached, the thermostat should open and you should visually see the coolant flowing through the radiator. Get a message that reads engine hot ac off and the temp gauge is at 0 so dont know if it is really hot. When the dashboard shows 'engine hot' and the AC turns off while the temperature gauge reads 160°F without rising, check the coolant temperature sensor and radiator fan operation. Remember to prioritize routine maintenance to preserve the accuracy of temperature measurements and keep your car in top shape. The needle on the temp gauge doesn't move off of cold. Aug 6, 2004 · Engine Hot A/C Off Warning Light On but Temp Gauge Cold Issue Model often shows false engine temperature warnings and inconsistent gauge readings during startup. Kicking him out into the wind without shelter was even worse. Sep 17, 2020 · The engine temperature sensor or associated wiring is failing causing the temperature gauge to drop to zero and the Engine Control Unit/computer/module is shutting down the AC to protect the engine. The temperature gauge on my bike read 12 degrees Fahrenheit. The fans stay in at full speed for a bout 2 mins s after I turn off the car. Jul 21, 2023 · This article will cover the possible reasons your temperature gauge is reading cold while your engine is hot and AC is off to help you narrow down to what the issue could be. While driving in the highway, the dash displayed “Engine Hot, A/C Turned Off” while the temp reading dropped to the lowest reading. Feb 27, 2023 · If your car's temperature gauge goes up and down, do not panic! Here are the reasons why the temperature gauge fluctuates and how to fix the problem. Then as I was almost home, my check engine light came on?? Other than that, the truck Jun 24, 2018 · Hello all, my 2014 will be at normal operating temperature and occasionally the temperature gauge will drop to the bottom of the scale and the fans turn on, and then the AC will stop blowing cold air. If your temp gauge shows cold when your engine is certainty hot, it could be your temp Mar 24, 2021 · How to reset coolant temperature sensor 16 Verano. Sep 29, 2023 · This feature prioritizes engine cooling and maintains optimal performance. Watch the first eight minutes of this veideo: Late 2000s chevys all seem to share this issue and here is how to pull over, fix it, and keep trucking. Apr 14, 2019 · After driving for a while the temperature gauge drops all the way down, the warning display light-up with "ENGINE HOT A/C TURNED OFF" and the electric fan comes on. "Hey, deaf man! I'm talking to you!" the second cop yelled, stepping forward. Sep 29, 2025 · There was no leaks (or at least I thought there wasn’t) but unfortunately the AC off due to high engine temp was still displayed. In this guide, we’ll take an in-depth look at what this warning means Most likely the engine coolant temperature sensor or the wiring is no good. One potential culprit for the overheating issue could be a malfunctioning AC compressor, which can exacerbate engine temperature problems. Apr 12, 2021 · This morning as I parked at work my AC cut out and blew hot air. I started off by checking if there was any pressure in the system by putting my key in the low side port and there was. Cooling Fans are running full boar after engine start and car is cold. Apr 1, 2023 · I have a 19 Colorado 3. I checked under the hood and the engine isn't any hotter than normal. I have replaced the cooling temp sensor (multiple times) and even the pigtail connector for it This is how you fix a condition where your Chevy vehicle says that your AC is off due to high engine temp. Mechanic's Assistant: Did you hear any ticking noises, or smell any burning when it overheated? Customer: It did not over heat. Started happening this winter, one day we got the AC off due to high engine temp message, but the gauge read fully cold. Jan 13, 2020 · I have a 2013 Chevy Malibu 2. Apr 22, 2021 · I'd start there. Start by inspecting the coolant temperature sensor for accurate readings; replace if malfunctioning. This occured right after we got back from picking the girls up at school so I know the engine is warmed up to operating temp. Worried about your car running hot? Discover what your temperature gauge is telling you, what normal readings look like, and how to handle overheating safely. If it reads hot, then this means your engine is likely overheating. So I know the engine is not hot. But of course, there is always a chance that the engine really is overheating. whats going on? Jan 19, 2023 · Looking at buying a 2017 XT5, luxury. Also, put a glove on and squeeze on the bottom radiator hose. When that happens, the cooling fans operate on high to protect the engine since it can't tell what temperature it is any more. Reads that even before I turn the car on. Again this is a guess. To efficiently address this issue, it’s essential to identify the signs and understand the underlying causes. FIrst i disconn We would like to show you a description here but the site won’t allow us. Here's the diagnostic procedure he recommends for troubleshooting this problem. "Engine Hot A/C Off" I would plug in the cheap code scanner I keep in the car for emergencies and check for codes. Made three - four stops and it came up every time after a few mins of driving. 6 and my radiator fan is running nonstop, this is the third time it's happened in 3 months, anyone have a solution on what to start with first, coolant level is right, I know it could be several things. Later, after engine off for over an hour, started car (heater off) and same thing. I then noticed the connection between the throttle body heater inlet hose and the thermostat housing was slightly leaking. 5 Chevy Impala ENGINE HOT A/C OFF dashboard light on? Temperature gauge stuck on cold? easy fix! Replace the coolant temperature sensor, and remember; disconnect the car battery while doing 16 hours ago · Hello I’m Selling a really nice well kept 2001 GMC Yukon Denali AWD V8 6. I first replace the thermostat, then took it to autozone for the obd and it pulled the code for the coolant temp sensor. Customer: My 2008 Equinox's temperature gauge stops working; it indicates the engine is hot, the A/C blows hot air, and it advises turning off the A/C. Chevy Forums FREE technical assistance for your restoration and repair. Nov 5, 2020 · The car keeps saying the engine is hot and the ac is shut off due to temp. Nov 19, 2017 · So I ran into this issue earlier in the summer, the temp gauge would stop reading any engine temp and it would give me the same message. concerned that without a SES code it will be like chasing a ghost. Has anyone experienced this problem? Sep 2, 2024 · 11-04-09 "Engine Hot A/C Off", No Engine Light, Temp Guage reads dead Cold. Just got Dec 17, 2012 · The temperature gauge in the cluster would not move, and the radiator fans are running on high. I have a ScanGauge II connected and it reads engine temp at 173 degs F. Yes I have radiator fluid, no leaks noted. If the engine is not actually overheating, the problem could be a faulty coolant temp sensor, shorted/open wiring or failed PCM. Watch the first eight minutes of this veideo: Customer: Engine hot ac off warning, temp Guage reading zero even when car has been off for hours. Regular vehicle maintenance, such as checking the coolant levels and the condition of the radiator and cooling system components, can help ensure the AC functions properly and the Jan 30, 2025 · Engine Hot Ac off But Temp Gauge Reads Cold If your engine temperature gauge is reading cold, but the “Engine Hot AC Off” message is displayed, there are a few things that could be happening. Apr 14, 2019 · Once I am stuck in Engine Hot A/C Off mode and dont clear it, my OBD2 App gauge will follow temp all the way up and down perfectly as it starts (cold) all the way to 190 (hot running) until I clear the code. When the gauge side goes bad, it will always read cold or hot, but there is no effect on engine operation. the engine oil was around 163 degrees . Dec 14, 2021 · If your Chevy Impala continues to display the ‘Engine Hot AC Off’ message after performing these checks and fixes, it’s time to surrender the baton to the professionals. It also runs the fans for about five minutes after the key is turned off. My first thought is to replace the thermostat. 2011 Chevy Silverado 4. This situation can be alarming and inconvenient. Oct 8, 2018 · I've been able to get help from this forum in the past by reading old posts, but I haven't found a solution for this one yet. We would like to show you a description here but the site won’t allow us. Within the last week I’ve gotten “AC off due to high engine temp” and the gauge stays on the “cool” side. May 16, 2021 · Now I am getting the message “engine hot turn AC off” and the temperature gauge does not move at all from cold. Find out here. Has anyone experienced this problem? Jul 6, 2018 · Just got a message " Engine Hot/ AC off " however temp gauge was still In the cold zone. Dec 24, 2025 · The root cause of this false high-temperature reading is nearly always a failure of the Engine Coolant Temperature (ECT) sensor. Then, with the engine cold and radiator cap off, turn on and run the engine until operating temp, and turn the heat on full blast. The engine temperature sensor is a common failure and is relatively inexpensive to have replaced. Jan 6, 2025 · If your A/C turns off due to high engine temperature, you should look for a safe place to park and then check the temperature gauge on your dashboard. Mar 16, 2022 · The sensor had failed, making the gauge read "0". ” Reading and understanding your car 2008 3. Was not hot . I already installed a 7" fan in the engine bay which has worked wanders for comfort in the cab. Mar 1, 2010 · Just got the "engine is hot/AC off message and the engine temp gauge reading cold. I though it did it more in wet weather, but today is dry (though yesterday rained). I have a 2014 Traverse with 63,000 miles My engine temperature gauge intermittently stops working (bottoms out, doesn't move) and along with that, the A/C shuts off We would like to show you a description here but the site won’t allow us. 3 V6 with 40000miles. 3L equipped vehicle suffering from a common problem where there is a message on the divers information display stating that the Engine is hot and AC Turned Off? Aug 21, 2019 · Your car temperature gauge seems straightforward: a needle that shows you whether your engine is hot or cold, with a “safe zone” of temperatures in between. Come this afternoon to go home still No AC, and my coolant temp gauge didn’t work. Then, after driving for a several minutes, I happened to catch the temp gauge suddenly change from pegged cold to about half way. In hot weather or during heavy-load situations, it is essential to monitor the engine temperature gauge to prevent any overheating issues. It did this yesterday. The gauge suddenly going cold was just as scary as it going hot, lol. Oct 10, 2009 · The exact same problem but the temp gauge drops to cold only when the AC off warning comes on and usually it all goes back to normal 20 mins after it starts Gonna check the codes today Hi everyone. Not totally unusual, usually kicks back on after a bit. Dec 2, 2022 · If your car’s AC has suddenly shut off due to high engine temperature, it is important to take action quickly, as it can cause serious damage to the engine. Is your Chevy Silverado or GMC Sierra 4. The temp gauge was completely dead - showing no temp. New here, I just got this 24 QH13R hour meter reads 553. This is on a 2008 Chevrolet Colorado. Reply reply Avanixh • How to solve this error message on a 2013 Sierramore. Customer: 2008 impala light comes on engine hot a/c off engine is not hot and temp gauge goes to cold Answered by Dave Nova in 2 mins 11 years ago Oct 6, 2023 · The temperature gauge tells you about the engine coolant temperature. Thank you. How do you troubleshoot a temperature gauge not working and fan running? A blown fuse and low coolant are common causes that can be diagnosed and fixed easily. 5 Lt. Factoring in the wind chill, it was easily below zero. Jul 28, 2025 · The “AC off due to high engine temperature” warning is a serious issue that can arise in vehicles. 3l v6. Imagine you’re enjoying a comfortable drive with the air conditioning on, only to suddenly notice this message on your dashboard, accompanied by the AC shutting down. Jan 15, 2020 · The next day I noticed my temp gauge not working and AC was not blowing cold air. Used to happen a lot in an old car of mine. Yeah didnt see Impala - engine hot ac off - on dash where the odometer is this popped up engine hot ac off. It will then go back to normal once I restart it. the engine fan is running. Feb 22, 2023 · If your car temperature gauge stays on cold even if the engine is warm, there are some common reasons why this problem occurs. Did some googling/youtube and read some basically replaced the thermostat and the coolant temp sensor with a flush and well the problem was fixed til few months back it Jan 27, 2025 · The first steps to take include turning off the air conditioning (AC) and activating the heater, as these adjustments help to dissipate heat from the engine. I read that it could be either the sensor or the thermostat. Leaving a man on the concrete in this weather was a death sentence. The check engine light is now on and there is a loud fan/vent noise that continues for a few minutes even after the car is turned off. This common problem can be addressed with a simple on-the-road fix. I knew something was wrong when none of the cans were cold but all emptied out, still no cold air. Nov 25, 2025 · If you own a car and have encountered the frustrating issue of the “Engine Hot AC Turned Off” warning light, worry not. Then as I was almost home, my check engine light came on?? Other than that, the truck Jan 15, 2020 · The next day I noticed my temp gauge not working and AC was not blowing cold air. If I shut it off for 30 seconds or so. This causes the vehicle to read -40 Celsius (maxed cold temp) and turn off ac to prevent more heat being put in front of radiator (fail safe mode) because it doesn't know what temp the coolant is. Coolant overflow tank was fine. Dec 17, 2012 · The temperature gauge in the cluster would not move, and the radiator fans are running on high. Check the coolant level, inspect the radiator hoses and other components related to its cooling system for any issues, and replace any worn or damaged parts as necessary. I check the ECM with the ScanGauge II and it shows a bunch of odd-ball codes which have no meaning. I'm surprised you have no codes. Driving home from work, same issue but then the Started happening this winter, one day we got the AC off due to high engine temp message, but the gauge read fully cold. Mar 12, 2011 · I have a 2008 1500 4x4 4. Failing to treat an overheating engine can lead to severe engine damage. This happened after I was on my way to work (6 miles on the freeway). Model specific subject matter experts, classified ads and more. A faulty temperature gauge can slow down your vehicle’s performance and fuel economy. Other causes include a stuck open or closed thermostat, or it may be just a random engine control unit glitch. The water temp gauge is stuck at the lowest reading as if it's not working. Sep 26, 2023 · The most common cause of the “engine hot, AC off” warning message is a faulty engine coolant temperature (ECT) sensor or damaged ECT wiring. A temperature gauge stuck on cold with the cooling fan running post-shutdown often indicates a faulty coolant temperature sensor or a stuck cooling fan relay. Jul 13, 2023 · A consistent cold reading on your car’s temperature gauge is not as harmless as it might initially seem. Impala - engine hot ac off - on dash where the odometer is this popped up engine hot ac off. Jul 21, 2023 · Bottom Line There you go-why your temperature gauge could be reading cold when the engine's hot and the AC is off, how to make a diagnosis and fix the issue. When the bubble is by the sensor it'll read cold, then some hot coolant will flow through and heat the sensor, repeat. I recharged the AC system with 3 of the 12 oz cans. recently after an oiled change, the fan is running at full speed as soon as I start the car and a message appears on the dash the reads something like ac is turned of to avoid engine overheat. Recently the ENGINE HOT A/C TURNED OFF warning pops up, but the engine isnt really hot. 9 but I think someone left the switch on, everything is super tight, runs great and everything works. This sensor is a thermistor, a resistor whose electrical resistance changes predictably with temperature. Not sure what to do at this point. Nov 17, 2015 · I pulled over and checked: The engine was not hot, could squeeze radiator hoses and even open coolant reservoir. How to check your temperature gauge and fix the 'AC OFF' light on the cluster. Jun 7, 2020 · my truck got this message a while back, ac wouldn't blow cold but still blew, and temp gauge read cold all the way down. 0 180K Miles Runs excellent, fully loaded with power options, cold ac & hot heat, alloy wheels, tow package , roof racks , We would like to show you a description here but the site won’t allow us. Jul 22, 2020 · So your car’s temperature gauge is acting up, or not working at all, and you want to fix it? Check out our article on how to fix a temperature gauge! How to check your temperature gauge and fix the 'AC OFF' light on the cluster. I looked in the coolant reservoir and the inside was coated with and full of chocolate doo doo. I've also read some threads on this forum about cases where the thermostat is on the fritz, it denies use of the temp gauge, which might explain the gauge showing cool. Aug 7, 2023 · The engine temp gauge will randomly drop to "cold". Ignoring this can lead to severe engine damage. I replaced the the coolant temp sensor and verified electrical continuity on the harness wires and the attached connector contacts that mates to the sensor. Oct 5, 2024 · The AC turns off due to high engine temperature, and the gauge not working indicates a possible sensor issue. Could use air conditioning but we can't have it all lol. . the temp guage reads cold and stays on cold. The warning that the assisted steering is reduced. However, not every car has this type of setup, as some feature a digital readout with actual temperature numbers, and others simply have a red light for “hot” and a blue light for “cold. Jan 25, 2022 · The symptoms include the steering error, the AC not working, the temp gauge pegged on "C" cold, and the thermostatic fan in front of the radiator running full tilt at high speed. In addition, it cuts out the AC to reduce load on the motor as well. Had a fault code for the engine coolant temperature sensor. It does come with a third party warranty Oct 14, 2023 · What’s up yall, been having problem after problem with the engine hot ac off warning and the temp gauge reading cold. All was good, then BAM! the message comes up and guage reads dead cold (and Oct 17, 2020 · Well, most of the time the temperature gauge works correctly, and when it is reading high the engine is overheating, but sometimes the gauge messes up. The engine check light turned on, finally took it to the auto parts to get the code read it was the Thermostat. Engine and upper radiator hose were not too hot. It turned off the AC motor is it the AC or freon Dec 8, 2016 · Morning all Out of the blue driving to work, my 2010 2500HD tells me 'ENGINE HOT, A/C TURNED OFF'. The check engine light is on with a temp sensor out of range code. Thanks in advance. And the auto off shows off all the time. Read on to find out what else could be wrong if the gauge is reading high, but the engine is not overheating. I still am on GMPP warranty . Jan 4, 2024 · Engine Hot AC off means the PCM "thinks" the engine is overheating, so it disables the A/C compressor. The sensor itself is about $20 shop cost and ~$28 list. Yeah didnt see Aug 31, 2022 · Learn why your AC may turn off due to high engine temperature and the steps to prevent overheating and maintain optimal vehicle performance. I’ve replaced the coolant temp sensor and thermostat and it was fixed for about a month but it came back. My temp gauge has been fluctuating recently. Apr 7, 2015 · The problem : The temperature gauge on my 2008 Impala LS (V6) stopped working. It just reads that and the gage is not working Jul 22, 2019 · With the Corvette, symptoms are the temperature gauge is set to stay on C, the engine cooling fan runs at high speed, and the AC is disabled; these are all safety measures because the ECM doesn't trust the temperature sensor under these conditions and chooses a set of parameters to reduce the odds of an actual engine overheat. Then Jan 30, 2025 · Engine Hot Ac off But Temp Gauge Reads Cold If your engine temperature gauge is reading cold, but the “Engine Hot AC Off” message is displayed, there are a few things that could be happening. Aug 27, 2024 · The AC only blew air that was whatever the ambient temperature outside was. The temp gauge is usually fine and today while driving the gauge just stops reading and is directly on cold after driving for 30 minutes in the heat. The message "Engine Hot A/C Off" was displayed. It takes roughly 30 min to 1 hour to replace and sometime the plastic clip breaks. I disconnect the battery cables, reconnect them, and everything works for a while. Pulled over to check under the hood.
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