Why is the warning "Engine HOT / A/C Off" appearing when my car is COLD?


Asked by Feb 02, 2015 at 10:07 AM about the 2010 Buick Lucerne CX1

Question type: Maintenance & Repair

I live in CT where it has been in the single digits the past week. This warning came on
when I started the car to warm it up. The car was NOT hot.  It's a 2010 Buick Lucerne.  Is
this just a sensor? I see some people actually disconnected the battery and it reset it.  I
really dont have the means to spend alot of money if this is a simple fix.

3 Answers


Sounds like the coolant temp sensor or the wiring going to it is shorted to ground. When this happens the computer "thinks" the engine is overheated. HTH. -Jim

3 of 3 people found this helpful.
Best Answer Mark helpful

Thank you, Jim

2 of 2 people found this helpful.

You're welcome. Glad to help. Thank you for the best answer click. -Jim

2 of 2 people found this helpful.

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