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 out of 3 people think this is helpful.
Best Answer

Thank you, Jim

1 out of 1 people think this is helpful.

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

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions


Looking for a Used Lucerne in your area?

CarGurus has 2,799 nationwide Lucerne listings starting at $1,848.


Search Buick Lucerne Questions

Buick Lucerne Experts

#1 DrakeTJ
Reputation 580
#2 seastorm709
Reputation 570
#3 jeffsbuick
Reputation 560
View All

Related Models For Sale

Used Buick LaCrosse
247 Great Deals out of 21,995 listings starting at $1,898
Used Chevrolet Impala
652 Great Deals out of 31,513 listings starting at $1,300
Used Buick Regal
106 Great Deals out of 10,474 listings starting at $1,995
Used Chevrolet Malibu
847 Great Deals out of 83,735 listings starting at $1,395
Used Cadillac DTS
52 Great Deals out of 1,716 listings starting at $2,950
Used Buick Enclave
405 Great Deals out of 25,653 listings starting at $4,950
Used Chrysler 300
342 Great Deals out of 20,919 listings starting at $1,000
Used Dodge Charger
289 Great Deals out of 28,291 listings starting at $1,997
Used Ford Taurus
234 Great Deals out of 19,657 listings starting at $1,500
Used Nissan Altima
955 Great Deals out of 78,062 listings starting at $670
Used Honda Accord
720 Great Deals out of 78,682 listings starting at $899
Used Toyota Camry
929 Great Deals out of 91,050 listings starting at $990
Used Cadillac CTS
263 Great Deals out of 12,007 listings starting at $1,495

Used Cars For Sale

2010 Buick Lucerne CX1 For Sale
35 listings starting at $6,117