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Thread: Car runs hot with a/c on

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Posts: 1-8 of 8
2010-01-21 20:56:11
Car runs hot with a/c on
Hey I have an issue I forgot about, and I should try and figure it out. My car during summer starts to overheat when I have the a/c on. If I turn it off, the car will cool down again. What could be the cause of this? My radiator is new, my coolant mix is good.
2010-01-21 21:02:32
does the 2nd fan kick on?
2010-01-22 01:59:50
Yes the fans work the way they should. The compressor is new.
2010-01-22 02:05:33
how many miles on the car??? whens the last time the WP or even the Tstat was changed
2010-01-22 05:46:01
New A/C radiator? There is a special A/C radiator in front of my radiator on my B13.

A/C has special coolant like R134a coolant (IRDK what coolant is has) and I'm not sure, but I don't expect it to be hooked up with engine coolant system.

I'm gonna remove it too
2010-01-22 07:36:36
I don't think it's the water pump or thermostat. It works perfect, even in 100+ degrees. The only time it will start to overheat is when the a/c is on and the temp outside is close to or above 100 degrees. The engine has about 70k on it. The a/c compressor, evaporator, and r134 are new. The car has a new radiator. The fans come on at the correct times. I just can't figure it out.
2010-01-22 07:39:04
Maybe your radiator is getting heat soaked from the a/c condenser?
2010-01-22 17:14:43
Sounds like the thermostat isn't opening as far as it should.
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