my suv 2003 runs hot until i turn on the ac


Old 10-18-11, 08:14 PM
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Join Date: Feb 2008
Location: united states
Posts: 21
my suv 2003 runs hot until i turn on the ac

i have 2003 bucik suv. it runs hot and doesn't over heats so far. when the temperation starts to go
up passthe half way mark. i would turn on the ac and
the temperation would start to go down stay down. as long i run the ac.
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Old 10-18-11, 08:44 PM
ukrbyk's Avatar
Join Date: Mar 2010
Location: USA/ Pacific NW
Posts: 3,313
yes, a/c turns on 2nd fan. that lowers coolant temperature.

I'd recommend replacing thermostat and having system flushed. sounds like radiator is clogged.
Old 10-22-11, 08:08 PM
Join Date: Jan 2006
Location: Ontario, Canada
Posts: 759
Be sure to check that rad cooling fan is coming on as well, without AC on.
Old 10-26-11, 10:23 AM
Join Date: Jan 2007
Location: North Central Indiana
Posts: 912
I agree when you are running without AC the fans are controlled by temp. When you turn on AC they bypass this stuff. Look for a bad temp sensor.

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