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rpmdiag, Tech and Instructor
Category: Buick
Satisfied Customers: 7891
Experience:  Since 1975
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2009 Buick Lucerne overheating, thermostat has been replaced

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2009 Buick Lucerne overheating
JA: Have you checked the coolant? Have you checked for a leak in the cooling system?
Customer: thermostat has been replaced and no leaks ,fans come on seems low but still overheat
JA: Are you fixing your Lucerne yourself? What have you tried so far?
Customer: replaced the thermostat
JA: Anything else you want the mechanic to know before I connect you?
Customer: fans come on low but car still overheats

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

The water pump fins can be worn out not moving the coolant as it should.

You should also check the radiator for blockage.

Thanks, Ron

If you are satisfied with my answer, I would greatly appreciate a 5
star rating now and I will still assist you after you have rated me
too if another question pops up. I don’t get credit for helping you
until you rate me.
Thanks again, Ron

Customer: replied 10 months ago.
I have replaced : thermostat, water pump, temperature sensor, and coolant. The cooling fans only come when A/C is turned on.
the fan only turn slow or on low speed.

You can have a bad fan control module then.


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