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Registered
Join Date: Jul 2005
Location: Crystal River, Fl
Posts: 56
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A/C not working
Hey Guys,
I have been picking away at the all of the "little things" on my car lately and am trying to fix my air-conditioning. It had been working and then the heater clip broke. I fixed the heater clip and then shortly after, the a/c compressor stopped coming on. I transplanted a HVAC controller from another 944 to see if it was just the dash switch, but nada. I checked all fuses and all are fine. If I press the a/c button, the fans come on and it acts like it wants to work, but no compressor. So finally I put power right on the compressor and it came on and cooled. What is keeping the compressor from getting power? Thanks, Brad
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'87 951 '88 951 not running... yet '03 A4 Avant 3.0 '98 Volvo S70 Lazy thoroughbred |
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12-09-2006, 02:27 PM
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Ornery Bastard
Join Date: Sep 2001
Location: South Sound
Posts: 2,879
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Low-pressure safety switch. You're low on refrigerant. Do NOT run the system, you will run the risk of damaging it.
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--------- Silver 1998 Volvo S70 T5 <- Daily (Anja) Guards Red 1986 951 <- Seattle car (Gretchen) White 1976 914 2.0 F.I. <- Prodigal car, traded away then brought back again (Lorelei) |
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12-09-2006, 02:52 PM
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Cars & Coffee Killer
Join Date: Sep 2004
Location: State of Failure
Posts: 32,246
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Just take it out.
 You could have a bad clutch on your compressor.
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Some Porsches long ago...then a wankle... 5 liters of VVT fury now -Chris "There is freedom in risk, just as there is oppression in security." |
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12-09-2006, 05:53 PM
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Location: Crystal River, Fl
Posts: 56
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Well, like I said, it works if a put power directly on the clutch, it just isn's getting power for some reason.
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'87 951 '88 951 not running... yet '03 A4 Avant 3.0 '98 Volvo S70 Lazy thoroughbred |
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12-09-2006, 07:59 PM
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You are correct and the reason it's not getting power is you are low on refrigerant as Aaron stated. Refill the a/c system and the problem goes away. As Aaron also said, low refrigerant = low oil....low oil = lockup of compressor.
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Tom 1990 944S2 Cabriolet 2002 Chevy Silverado 2500HD 2003 Maroon Ford F350 dually |
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12-09-2006, 10:08 PM
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Location: Crystal River, Fl
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Okay, I forgot to mention that I plugged my pressure gauge into the system to check the pressure; I understand that this can cause damage. The pressure checked out fine, even when the compressor was running. Something else is keeping the compressor from getting power.
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'87 951 '88 951 not running... yet '03 A4 Avant 3.0 '98 Volvo S70 Lazy thoroughbred |
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12-10-2006, 12:54 PM
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Pull the wires on the low pressure switch and see if you have power on one side. Could be a bad switch there.
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Tom 1990 944S2 Cabriolet 2002 Chevy Silverado 2500HD 2003 Maroon Ford F350 dually |
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12-10-2006, 06:24 PM
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Quote:
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Mike - CFI, A&P Mechanic w/ I.A., Aztec driver at Island Tyme '88 951S - zermatt silber/black - staying stock. purchased in 11-2006 '84 944 - gemini grau/tan+brown - lightly modified. purchased in 11-2001 2021 Tesla Y - to get me to work |
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12-10-2006, 07:04 PM
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Location: Crystal River, Fl
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Alright, I just looked on Clarks-Garage for information... this is the one thing that he doesn't have much info on!!! So where exactly is the low pressure switch located? How can I test it? I also read something about a relay behind my glove-box... should I check here?
Multas Gratias!! Brad
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'87 951 '88 951 not running... yet '03 A4 Avant 3.0 '98 Volvo S70 Lazy thoroughbred |
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12-10-2006, 07:09 PM
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Ornery Bastard
Join Date: Sep 2001
Location: South Sound
Posts: 2,879
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Quote:
http://www.pelicanparts.com/944/944_parts/944_83-85/Pic103.jpg
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--------- Silver 1998 Volvo S70 T5 <- Daily (Anja) Guards Red 1986 951 <- Seattle car (Gretchen) White 1976 914 2.0 F.I. <- Prodigal car, traded away then brought back again (Lorelei) |
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12-10-2006, 07:54 PM
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Location: Crystal River, Fl
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Thank you so much! I am headed home this Wednesday to begin work on it... I hate to have the a/c down for too much longer for fear of more problems.
Thanks! Brad
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'87 951 '88 951 not running... yet '03 A4 Avant 3.0 '98 Volvo S70 Lazy thoroughbred |
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12-10-2006, 08:00 PM
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Join Date: Nov 2003
Location: Calgary, AB
Posts: 1,883
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You say the pressure checked out fine, just curious what the readings were with the compressor on/off?
Check for 12V on one side of the low pressure switch, then if you have it check for 12V on the other side. If you have proper pressure and 12V on one side, then build a small jumper wire to connect the two sides (or in the case of mine since the terminals are bare, just touch them together) and check if the compressor kicks on. The low pressure switch is located either on or immediately beside the receiver/dryer behind the driver's side headlight. It has 2 wires going to it with terminals on them (there is another switch there that is hard wired, that is not the low pressure switch).
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2010 Hyundai Elantra Touring, GLS 5 speed, Indigo Blue Metallic. 2.0L of Korean fury! Buy my parts! |
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12-10-2006, 09:24 PM
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Grey car
Turbo
