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Old 07-21-2011, 11:22 PM   #1
sleepersaurusrex
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Default Finally got my AC running but now my engine over heats?

Ok so for the first time in a year I got my AC running again on my 03 WRX. I was so happy to have it working only to notice that my engine starts heating up while I drive. And one strange thing is that I can feel my engine lose power every so often just driving down the road. I am guessing that is from the AC compressor turning on and off the keep the pressure up. I checked the coolant level and that was fine, new thermostat and I doubt it's the water pump because it just gets hot it doesn't over heat. I just don't know, the fans come on everything appears to be normal but it's getting hot. Any ideas? Thanks guys!
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Old 07-22-2011, 12:43 AM   #2
Uncle Scotty
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I would guess that it being 100+ doesnt help things
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Old 07-23-2011, 04:47 PM   #3
sleepersaurusrex
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Quote:
Originally Posted by Uncle Scotty View Post
I would guess that it being 100+ doesnt help things
Yeah and I keep checking my coolant and I have air pockets in it. I don't get why these cars are so hard to get full of coolant.
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Old 07-23-2011, 08:21 PM   #4
veener79
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It could be the old radiator just can not keep up and with age is not flowing as well.
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Old 07-24-2011, 05:29 PM   #5
sleepersaurusrex
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Can't be that, it's a brand new mishimoto aluminum radiator and an upgraded water pump. I have been checking the coolant every time the car cools down and it's getting better.

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Originally Posted by veener79 View Post
It could be the old radiator just can not keep up and with age is not flowing as well.
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Old 07-24-2011, 05:57 PM   #6
hybrid gti 2
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Make sure that the fan on the passenger side is running when the a/c is on. Make sure it's plugged in.

100 degree's is not good as well. If you have the plastic rad. It might be a good time to upgrade that. The hoses to samco and the thermostat a bit lower like grimmspeed.
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Old Yesterday, 05:16 PM   #7
hybrid gti 2
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Has anyone got any further ideas on what could cause over heating only when the ac is running? I know it's been a few years but maybe someone had solved this, I hope.
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Old Yesterday, 11:13 PM   #8
z
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Quote:
Originally Posted by hybrid gti 2 View Post
Has anyone got any further ideas on what could cause over heating only when the ac is running? I know it's been a few years but maybe someone had solved this, I hope.
This just came up in another thread....

http://forums.nasioc.com/forums/show....php?t=2790673

I'll post the response here that I posted there....

Quote:
Originally Posted by z View Post
... All the exposed fins in front of your car are the A/C condenser. [which can get bent and restrict airflow]

The condenser is releasing heat when the A/C is on and it's going directly into the radiator.

If your airflow is impeded and/or fans not functioning properly, that can definitely result in running hot.
Quote:
Originally Posted by z View Post
Also, I was chasing down an overheating issue myself, part of which was caused by insufficient airflow.

Took me a while to discover that even though my fans were spinning...
They fans were not spinning fully up to speed because of a drop in voltage.


I wasn't able to tell when the car was running because they just looked like they kicked on and were spinning when they needed to. But with the car off, I jumpered them at the relays under the hood and could tell they weren't spinning very hard.

Voltage readings at the relay sockets confirmed a drop in voltage going to the fans.

see my thread here. :click:


c/n... clean grounds in engine bay that radiator fans ground to.
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Old Yesterday, 11:15 PM   #9
hybrid gti 2
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Ok that was my next idea. Thank you for confirming that.
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Old Today, 12:01 AM   #10
z
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No worries... good luck!
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