AC blowing hot after running awhile

2004 CHEVROLET TRAILBLAZER
110,000 MILES • 6 CYL • 4WD • AUTOMATIC
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MZWIZ
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On trips longer than thirty minutes on the expressway my AC goes from cold to hot and will not go back on. sometimes (rarely) if I stop and restart the car it will go back to cold but for the most part I cannot get AC again until the car is completely cooled down or next morning. What part needs replacement? Freon is good and there are no leaks per my mechanic who said he could not recreate the issue. Of course not because he dose not drive it for long distances. Help!
Jun 15, 2017 at 12:57 PM
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STRAILER
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Hello,

This sound like a classic ac compressor clutch coil failure. To confirm use a test light and check for power at the compressor with the system on and not working to confirm. If you are getting power then the compressor will need to be replaced. Here are some guides to help you get the problem fixed.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

and

https://www.2carpros.com/articles/replace-air-conditioner-compressor

Please let us know what happens, we are interested to see what it is.

Cheers, Ken

Jun 17, 2017 at 5:30 PM