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1999 CH AC Issue


valderickd

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First check your fuses and you may have an AC relay, check that also. If all there is good, than got to the next step.

With the key on, engine off, turn on the Ac and put the blower on, use a test light or meter at the wires at the Compressor clutch to see if there is power there. If the is, the magnetic clutch should be engaged. You can have somebody turn the AC on and off and see or hear the clutch engage, and you should not be able to turn it. If it is not engaged and you have power then most likely the clutch is bad. If you do not have power, then follow the AC lines back to the low pressure cut out switch, check for power in and power out ,while the truck is running with the ac and blower on. If you have power in and none out, jump the switch, if the compressor engages it it a bad Low Pressure switch. If no power there then I would head to the AC/Heater controls in the dash for a bad switch or wire connector. There may be a few other items I missed, but these are the basic checks for most every system. Paul

"OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK"  Thomas Edison

 “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’

P.T.CHESHIRE

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High pressure switch too. Seen the wires break on those. Trey

Good point, could be over charged from the get go. Paul

"OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK"  Thomas Edison

 “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’

P.T.CHESHIRE

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  • 2 weeks later...

One more thing, I've had the fan blower switch go bad. The fan would blow but would not have any a/c in high or low just in medium. Replaced the switch and all was good. And make sure all wiring harnesses are plugged up. sometimes its the stuff that makes you feel dumb.

Edited by a5redwing

Drew

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