Why is the warning "Engine HOT / A/C Off" appearing when my car is COLD?
340

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

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.

5 Answers
210

Kelly answered 5 years ago

2013 Buick Enclave and we had the same issue. Car was cold, and the TEMP gauge never moved off the cold, and the error came on " AC OFF / ENGINE HOT" or something like that. I was thinking the car isn't hot. So I am assuming its a sensor

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70

Tab001 answered 5 years ago

Engine hot a/c off car engine light came on gauge went to 260 started putting and almiat stopped on me. I put coolant fluid in the car let sit dor 7 hours and started to drive again with in 15 minutes later same problem again?

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