Another AC question

[Rich 89 Gr. Wag]

The clutch on the compressor wouldn't come on, so someone on this board suggested I jump the low pressure sensor to trick the compressor. Well, it worked. My system is empty, so I changed the fittings to the R134 ones, no problem. When I tried to charge the system, nothing happened. The can of R134 stayed full. I have one of those easy on/easy off adapters and it seems to make good contact, but the system with the compressor engaged isn't pulling the refrigerant into the system. I am connected to the low pressure side, so I'm not sure what gives. Any ideas where to look next? TIA.

[ITLBOK333]

I tried the exact same thing, what I did not do however is take out the little spring pin inside of the fitting, not doing that did not allow any r-134 in....maybe you did the same thing? Hope this helps. BTW, did you replace anything else, dryer, or just get the kit and fill?

[Rich 89 Gr. Wag]

I found the system to be empty, so I just bought the kit and went to town. Did the same thing on a BMW last month and it worked perfectly. Just bought the kit and filled it up.

[Rich 89 Gr. Wag]

BOK333,

You took the spring out of what fitting, the new low side screw-on fitting?

[ray krick]

Did you evacuate? I didn't see in your text if you evacuated or not.

[gsmikie]

what year ???? is it the york compressor ???? if it is does it have the valves you have to open to charge ???

[Rich 89 Gr. Wag]

gsmikie,

it's an 89 GW, not sure about the compressor type since I just lent out the Wag for a few days. You mention valves....on the hoses next to the compressor, there were two things that stuck out towards the front of the car. Are those the valves you're talking about? If they are, that makes total sense.

I didn't evacuate since the system was empty. If the above valve issue is correct, then I'll manually evacuate the system before I fill it up. Any freon in there has to be very minimal since there is no pressure in the system. Thanks.

[TexasJ10]

You really need to replace the drier with one compatible with 134a. It is possible that your system had work done it over the last 5 years and someone replaced the original with one that is compatible with 134 or r12, but if not, you must replace it. If you don't, moisture will circulate in the system creating a corrosive acid that will eat up the aluminum inside. It will seem like it is working in the short run, but over the longer haul you will end up replacing everything. If you spend a little time now it will be good for a long time. Replace the drier and evacute the system before adding pag oil and r134a.