my suv 2003 runs hot until i turn on the ac

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  #1  
Old 10-18-11, 07:14 PM
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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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  #2  
Old 10-18-11, 07:44 PM
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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.
 
  #3  
Old 10-22-11, 07:08 PM
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Be sure to check that rad cooling fan is coming on as well, without AC on.
 
  #4  
Old 10-26-11, 09:23 AM
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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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