Skip the auto shop - Our mechanics make house calls

Q: Message on my dash where speedometer is says ac off becasue engie temp is too high

asked by on

I got a message today that said my ac is off because engine temp is too high and my temp gauge doesn't seem to be working, it shows all the way cold. When I shut my car off it sounds like the fan or something is still running. I am wondering if this could be my thermostat.

My car has 107000 miles.
My car has an automatic transmission.

It sounds as if your car has put itself into a default mode to protect itself form overheating. The fact that the gauge shows it is cold indicates there is likely a problem with the coolant temperature sensor. When this system fails, the PCM (powertrain control module) assumes the car is overheating to protect it from getting too hot and damaging the motor further. The A/C condenser is mounted on the front of the radiator and adds heat to the cooling system, so it is turned off to limit any extra heat sources from contributing to the lack of ability to cool the car sufficiently.

I would begin diagnosing this by connecting a scanner and inspecting the data. Most likely you will see the CTS (coolant temperature sensor) has failed. Keep in mind, wiring to the CTS could be damaged and causing this problem as well. The CTS data should show a temperature that reflects the temperature of the motor. If you have been driving it recently, it will be in the 180F to 200F degree range. If you check the data with the engine cold, the data should reflect the ambient temperature. It is common for a failed sensor to show a reading of -40 degrees Fahrenheit. If you want to have the AC system and related components inspected, a technician from YourMechanic can come to your home or office to diagnose your car and let you know what needs to be repaired.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Message on my dash where speedometer is says ac off becasue engie temp is too high

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car radio works, pops, and then stops working

From the information provided on your Honda, it leads me to believe that the problem may be found in one of two places: the stereo itself or the wiring for the speakers. While is is possible to have all the...

Q: What features can I customize through the Vehicle Customization feature?

Using the Vehicle Customization feature, controlled by the Driver Information Center controls, 4 buttons located on the left side of the instrument panel behind the steering wheel, is used to customize the settings of various systems throughout the truck. Here...

Q: I have a 2012 equinox and it is rattling upon acceleration and kind of rough idleing when stopped

In practice, oil consumption varies quite a bit, so much so that there is no agreement on what is excessive. As a "general" rule though, if an engine uses a quart of oil or more in 1,500 miles, that's excessive....

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.