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The newest of the noobs!
Join Date: Jun 2010
Location: AZ
Posts: 813
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A/C woes…again!
Two summers of cold air til now. Replaced R12 compressor with R134a unit from Griffiths. Just quit on me the other day. Initial check at high pressure port, indicates refrigerant in system. Thinking electrical, haven’t checked refrigerant with gauges yet. Pulled relay, no burnt areas. Thought I would jumper low pressure switch next. Before, I turned key on, hit the snowflake and fans turned on. Need to know which wires of the four to jumper?
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1989 944 Turbo 2004 Jeep Wrangler Unlimited - Built! 1985 Saurer 6dm overland Swiss military truck/camper |
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08-02-2025, 04:39 AM
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Join Date: Oct 2006
Location: Laguna Vista
Posts: 2,185
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Easiest way to test is to pull of the relay G17 (this is for a 86 car but it should be the same for yours) test between pin 4 of the relay socket and ground it should be about 3 ohms or so. If it is 0 then the pull in coil on the compressor is shorted, if it shows open then either the low pressure switch is bad or the compressor pull in coil is open, or you have low pressure in the system. If it is open you can test direct from the switch connector to compressor to figure out which is bad.
Sox
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"Little problems always come back and bring bigger friends with them". 1986 951"MADDOG" black Dual port WG, 4 port control valve with EBC |
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08-03-2025, 06:41 AM
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The newest of the noobs!
Join Date: Jun 2010
Location: AZ
Posts: 813
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Thanks, I’ll give that a try!
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1989 944 Turbo 2004 Jeep Wrangler Unlimited - Built! 1985 Saurer 6dm overland Swiss military truck/camper |
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08-04-2025, 10:03 AM
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Join Date: Aug 2025
Posts: 23
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How big of a job is the changeover? When shipping cars I was leery to see one not already converted.
Hope ya get it worked out! |
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08-11-2025, 06:36 PM
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Registered
Join Date: Oct 2006
Location: Laguna Vista
Posts: 2,185
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Porsche put out a tech bulletin #9501 in December 1995, it covers the change over process.
Sox
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"Little problems always come back and bring bigger friends with them". 1986 951"MADDOG" black Dual port WG, 4 port control valve with EBC |
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08-12-2025, 08:28 AM
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The newest of the noobs!
Join Date: Jun 2010
Location: AZ
Posts: 813
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After 11 days, pulled car out of garage, and a/c works. Weird car sometimes.
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1989 944 Turbo 2004 Jeep Wrangler Unlimited - Built! 1985 Saurer 6dm overland Swiss military truck/camper |
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08-13-2025, 11:37 AM
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Registered
Join Date: Oct 2006
Location: Laguna Vista
Posts: 2,185
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As my tag line says...
"Little problems always come back and bring bigger friends with them" Sox
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"Little problems always come back and bring bigger friends with them". 1986 951"MADDOG" black Dual port WG, 4 port control valve with EBC |
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08-14-2025, 06:32 AM
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