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rpmdiag
rpmdiag, Tech and Instructor
Category: Buick
Satisfied Customers: 7191
Experience:  Since 1975
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I have 07 Buick lacrosse, my car is overheating and when I

Customer Question

I have 07 Buick lacrosse, my car is overheating and when I turn the AC on it overheats fairly quickly but when i turn my heater on defrost it starts to cool down. What could it be?
Submitted: 6 months ago.
Category: Buick
Expert:  rpmdiag replied 6 months ago.

Hi, I'm Ron and I will be helping you today.
Stand by for a moment while I prepare your answer.

Expert:  rpmdiag replied 6 months ago.

First, make sure your fans are working right.

next would be to check for a blown head gasket by doing a compression /cylinder leak down test.

Another thing that's rare, but a plugged engine block too can cause that.

Thanks, Ron

Expert:  rpmdiag replied 6 months ago.

Hi, I'm just following up with you to see if you have any more questions.
Thanks, Ron

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