overheating with ac on

pulido_gt · December 29th, 2010, 09:04 PM

Hello stang peeps, i have an 03 gt that only overheats with the ac on. i have changed thermostats like crazy even trying lower temp ones, flushed the system and even added cooler coolant. I hear my fan turning on but still overheats, i was reading somewhere that low level of ac freon could be the cause. any suggestions?
thanks
-joey-

Jimmyc206 · December 29th, 2010, 09:54 PM

Mine did the same thing. Do a physical inspection of your fan. If one of the blades is broken it wont be able to push the same amount of air through which can cause you to overheat. I think the fan is like 30 or 40 dollars at autozone. Mine did the exact same thing. Swapping the fan fixed it. If that's the problem it's usually accompanied by a real scary ticking that just becomes annoying until you swap it. Run w/o ac until you can get to a parts store and you'll be fine.

86er · December 29th, 2010, 11:16 PM

could be the fan motor, could be the pressure switch? I think thats the one, that kicks the fan on at a higher speed when the a/c is.

Myslowstang · December 30th, 2010, 12:34 AM

Originally Posted by pulido_gt

Hello stang peeps, i have an 03 gt that only overheats with the ac on. i have changed thermostats like crazy even trying lower temp ones, flushed the system and even added cooler coolant. I hear my fan turning on but still overheats, i was reading somewhere that low level of ac freon could be the cause. any suggestions?
thanks
-joey-

So you've done a visual check on the coolant system and everything checks out ok, right? Also you've changed your thermostat and flushed your system, correct? Then it might be time to replace your radiator.

Jimmyc206 · December 30th, 2010, 01:45 AM

Originally Posted by 86er

could be the fan motor, could be the pressure switch? I think thats the one, that kicks the fan on at a higher speed when the a/c is.

Forgot to mention I swapped the motor at the same time.

99GT35thLE · December 30th, 2010, 07:31 PM

What about the water pump, was it new when the motor was swapped?

If it's only with the AC, seems like maybe some belt slippage, the fan motor is going bad or the relay.

86er · December 30th, 2010, 11:44 PM

its electrical, the fan motor isnt seeing the a/c on signal to up the fan speed

December 29th, 2010, 09:04 PM	#1
pulido_gt Newbie 03 mustang gt 14.3 Join Date: Dec 2010 Location: Santa Maria. Ca Posts: 19 iTrader: 0 reviews	overheating with ac on Hello stang peeps, i have an 03 gt that only overheats with the ac on. i have changed thermostats like crazy even trying lower temp ones, flushed the system and even added cooler coolant. I hear my fan turning on but still overheats, i was reading somewhere that low level of ac freon could be the cause. any suggestions? thanks -joey-

December 29th, 2010, 11:16 PM	#3
86er I Post Entirely Way Too Much Join Date: Nov 2006 Location: Memphis, TN Posts: 7,630 iTrader: 0 reviews	could be the fan motor, could be the pressure switch? I think thats the one, that kicks the fan on at a higher speed when the a/c is. __________________ Just a truck 5.4 3v: 264hp 317ft lbs rock stock The "search" button, its not just for porn piecing together the next project faster than your first sexual experience

December 30th, 2010, 07:31 PM	#6
99GT35thLE Hardcore Enthusiast 1999 GT 35th LE Join Date: Dec 2009 Location: Jacksonville, Florida Posts: 1,428 iTrader: 0 reviews	What about the water pump, was it new when the motor was swapped? If it's only with the AC, seems like maybe some belt slippage, the fan motor is going bad or the relay. __________________ Drive it like you stole it

December 30th, 2010, 11:44 PM	#7
86er I Post Entirely Way Too Much Join Date: Nov 2006 Location: Memphis, TN Posts: 7,630 iTrader: 0 reviews	its electrical, the fan motor isnt seeing the a/c on signal to up the fan speed __________________ Just a truck 5.4 3v: 264hp 317ft lbs rock stock The "search" button, its not just for porn piecing together the next project faster than your first sexual experience

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