Posted by Brian Jasper co. Ia on July 02, 2008 at 18:29:44 from (67.142.130.26):
In Reply to: Re: AC posted by showcrop on July 01, 2008 at 17:52:51:
You did evacuate the system before charging right? Are you charging an R-12 system? It wasn't until the later years of R-12 that they changed the high side fitting so people who didn't know much about A/C would be unable to connect to the high side and explode the can. Original 134A systems are fool proof on their connections. If it's trying to pressurize the can you're on the high side. It's impossible to pressurize the can on the low side. 1. You need a manifold gauge to see what's going on. No way around it. 2. You need a vacuum pump to remove the air and moisture that enter the system with lines disconnected. No way around it. 3. When charging from small cans always purge your can tap hose each time before you connect it to your gauge. Air mixed in the refrigerant dilutes it and causes higher than normal pressures with reduced cooling performance. If the low side port is right on the compressor NEVER turn the can of refrigerant upside down to get liquid to charge faster. Liquid refrigerant entering the compressor can cause valve failure or a twisted off shaft. 4. Why did you replace the compressor? Just leaking or catastrophic failure? Did you check the expansion valve for debris? If it shredded itself, you need to flush the system or you'll destroy that new compressor and plug your expansion device. 5. When opening an A/C system you should always replace the dessicant. Some are receiver/dryers on the high side between the condenser and expansion valve. Others are accumulators on the low side between the evaporator and compressor. 6. You need lots of fan through the condenser. If the engine fan clutch is tired, you won't have enough heat removed from the refrigerant and have too much high side pressure with poor performance. 7. You need a leak detector to find small leaks. Soap solutions can find large leaks. Tracer dye and a black light work well for small leaks. 8. If you need more help, feel free to email me. I'm the primary A/C tech in the shop I work for.
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