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Short story....kind of

 

I have a '90 Legacy that had R12. When I bought the car (two weeks ago) the air conditioning kind of worked sometimes. I called everywhere here in Salt Lake City and couldn't find anyone that had R12 so I converted it to R135. I bought a vacuum pump. Vacuumed the system out and added the R135 oil and two cans (12 ounces each) of refrigerant. BUT, the compressor will not come on at all. I have to run a "jumper wire" to make it come on but then of course it runs all of the time.

Could it be one of the four (4) relay switches in the relay switch "box"?? Any help would be greatly appreciated.

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When you say you converted it to R134, how did you go about doing this?

 

Also, it may be your solders at the back of the board where all the AC controls are. They tend to break after 20 years or so. The AC just kind of comes on when it wants to...or when you hit a big bump. You could check the relays, I guess, but

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When I converted the system I evacuated the system, changed the fittings, pulled a vacuum on the system, then added the R134a oil and two cans of refrigerant.

 

So, I need to pull out the Heater/Air conditioning push button control box?? Is that where the solder points you were talking about are??

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it may take more than that, also test your High/low pressure switch on the high side line. look for a sender with plug. im gonna run a hotwire from a toggle to the high/low then to the control circuit of the a/c clutch relay on mine. it never had a/c but the switch will make it cycle appropriately!
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it may take more than that, also test your High/low pressure switch on the high side line. look for a sender with plug. im gonna run a hotwire from a toggle to the high/low then to the control circuit of the a/c clutch relay on mine. it never had a/c but the switch will make it cycle appropriately!

 

Could you go into more detail on how your going to do that? I found the high pressure switch. It has 4 wires. I was going to try to run a jumper wire to see if I can get the compressor clutch to engage but I'm not sure how to test the high pressure switch. I can run a jumper wire to the plug located just behind the actual compressor and the compressor will work but obviously stay on all of the time and not cycle like it's supposed to. Thank you all for the help. It's greatly appreciated.

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i had made up a relay control in my head last time I looked at the FSM pinout. give me till later...

 

 

Ok..Thanks again for the help. I'm leaving town for a few days today anyway so no biggie.

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