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Below the Rim
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A/C Trouble
A/C has worked fine, though not ice cold, on my '79SC. Yesterday, I went to run it just to circulate the coolant/lubricant. Nothing. No fan, no compressor. Fuses OK. I was thinking of starting with the relay, but I wasn't sure if both circuits (fan and compressor) depend on the relay to work. Thoughts? I don't use the A/C much, but I want to keep the car original, and I hate when stuff doesn't work.
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1979 911SC Coupe |
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05-19-2006, 04:33 AM
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Detached Member
Join Date: May 2003
Location: southern California
Posts: 26,964
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My guess is a low pressure switch, you've lost enough freon that it won't turn on. Can't hlep with where, but on many cars its on the receiver/drier in the front left wheel welll. You can use a jumper to bypass and test.
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Hugh |
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05-19-2006, 04:45 AM
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MAGA
Join Date: May 2004
Posts: 10,769
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My '79 stock AC does not have a pressure switch. Newer cars have them but '79's do not. You might want to check your fuse block as my AC quit once and it ended up being a bad contact at the fuse and the fuse block terminal area where the fuse block recieved it's power.
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German autos: '79 911 SC, '87 951, '03 330i, '08 Cayenne, '13 Cayenne 0% Liberal Men do not quit playing because they get old.... They get old because they quit playing. |
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05-19-2006, 05:29 AM
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Retired Member
Join Date: Sep 2005
Location: Guelph Ontario
Posts: 2,513
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Check the relay in the box where the evaporator is. Sometimes it can stick.
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80 911 SC sold 17 Tahoe 07 Z06 Corvette 
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05-20-2006, 06:32 AM
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no fan blower? even with the a/c off?
ryan
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To the memory of Warren Hall (Early S Man), 1950 - 2008 www.friendsofwarren.com 1990 964 C4 Cabriolet (current) 1974 911 2.7 Coupe w/sunroof 9114102267 (sold) 1974 914 2.0 (sold) |
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05-20-2006, 08:02 AM
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Start with this rather simple schematic for the AC at this link:
http://www.pelicanparts.com/911/911_Parts/Electrical/911_electrical_82SC_AC.jpg
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Kuehl 1987 911 cab, modified https://griffiths.com/ |
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05-20-2006, 05:36 PM
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Registered
Join Date: Feb 2002
Location: Planet earth
Posts: 867
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Had exactly the same problem,mechanic added some freon located the leak,fixed and recharged it and viola COLD air now...
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05-20-2006, 06:24 PM
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Below the Rim
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Bigchillcar - No. that's why I'm wondering about the relay. With no freon and no lo-press switch, the fan should still come on. Fuses check out, but I'll look again.
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1979 911SC Coupe |
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05-21-2006, 12:19 PM
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Look at the schematic mentioned before, locate the relay,
get your check light or VOM and follow the procedure.
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Kuehl 1987 911 cab, modified https://griffiths.com/ |
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05-21-2006, 01:07 PM
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agreed..that fan should work even if you've removed the compressor completely from the car. can't recall if there's a blower relay, but there must be..like kuehl says, locate it. might check pelican's parts section under a/c components and see if a fan relay is listed..
ryan
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To the memory of Warren Hall (Early S Man), 1950 - 2008 www.friendsofwarren.com 1990 964 C4 Cabriolet (current) 1974 911 2.7 Coupe w/sunroof 9114102267 (sold) 1974 914 2.0 (sold) |
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05-21-2006, 06:27 PM
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Check the relay in the smuggler box. You can buy a similar automotive at Rat Shack or pay big buck for a genuine PORSCHE box relay that is now made in CHINA.
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05-21-2006, 07:53 PM
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were'nt they always made in China?
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Kuehl 1987 911 cab, modified https://griffiths.com/ |
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05-22-2006, 03:49 AM
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1974 Porsche 911 2.7
