Question about 1994 GMC Sierra

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How do i fix my a/c system? it doesnt blow out cold air

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The first thing is to check the freon, make sure the system is full, if its low then an evacuate and recharge is needed with oil and dye, then check for leaks, by recharging the system you will be able to find leaks and check the systems operation, this make sure the system is good and cold and compressor is good, its like a flat tire you cant find the leak until you fill it with air, good luck and hope this helps.

Posted on Sep 02, 2010

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Posted on Jan 02, 2017

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If it wasn't blowing cold air before and after the recharge, it could be the thermo expansion valve.

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Im assuming that the compressor kicks on. If it didn't you wouldn't have been able to charge the system.

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