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Re: I recharged ac no cold air
There is an over pressure protection switch that could be at cause and there is an under pressure protection switch that might be at cause and there is also the on/off pressure switch located on the dryer canister that actually controls the temperature of your evaporator that might be just plain wore out. Last I remember NAPA wouldn't even stock these as they wear out within a month of use and just quit like your situation. My solution to that is to hot wire them on with a section of bare copper wire within the plug assembly - cu'mon GM you have to do better than that to stay slovent. Opps, too late.
So, what pressure(s) are you running and/or can you trace down the lack of electricty to your compressor's clutch? You've just started to trouble shoot this problem.
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Apart from doing a low side pressure check, you can try to recharge the system yourself with a refill kit that's readily available at most auto parts stores. If you're concerned about a leak, also get a can of R-134A with the UV dye that will show any leaking components. RECHARGING AC SYSTEM
Turn the truck on and turn AC on HIGH
Locate the low side AC line (will have a valve and cap similar to the cap on a tire)
Insert the oil or R-134A can to the hose (Do not turn the screw to puncture the can yet)
Insert the other end of the refill hose to the low side valve
Puncture the R-134A can with the screw on the refill hose
You should feel the system suction the refrigerant out of the can
Check for frost on the AC lines and the air blowing inside the truck
If frost develops and the air is cold, you've successfully recharged the system and disconnect the refill hose. DO NOT ADD MORE REFRIGERANT...overcharging the system will damage your compressor and will be less effective
Hopefully this answers your question and you're able to get your AC working again. Best of luck.
bamerson: have your A/C system pressure tested. Verify you have enough Freon in your A/C system. If your pressure is low, or no pressure is detectable, then you should recharge your A/C system and check for leaks with liquid dye or a Freon sniffer. If this information has been helpful, please vote, thank you.
the low pressure port is the charging port, this port is either in the low pressure line or the accumulator that the low pressure lines to to (can shaped object), the low pressure line is the larger of the two lines from the compressor.