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My AC keeps blowing hot air and engine overheats when AC is turned on

Tiny
ISABEL MARTINEZ
  • MEMBER
  • 2004 CADILLAC ESCALADE ESV
  • V8
  • AUTOMATIC
  • 168 MILES
I took off the thermostat to avoid overheating. I already changed the fan clutch, radiator, AC compressor, the water pump, and some hoses. It still overheats when the AC is turned on with the thermostat on and blows hot air.
Monday, September 17th, 2018 AT 1:07 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,278 POSTS
Hello,

The engine needs the thermostat so you will need to reinstall that and clear the codes. Next lets test the engine for a blown head gasket by following this guide.

https://www.2carpros.com/articles/head-gasket-blown-test

This guide can help as well.

https://www.2carpros.com/articles/engine-overheating-or-running-hot

Please run down these guides and report back.

Cheers, Ken
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Tuesday, September 18th, 2018 AT 4:13 PM

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