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#1
07-02-2007, 08:54 AM
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AC system troubles...
Well to begin with, it's been some time since I've posted at the ole shop forum. Its good to know there are some of the names I remember still posting!
Well, it seems I am going to need some air conditioning with these record high temperatures around here and mine is being quite temperamental. A long while back I had the AC compressor changed, I think it was used once and seized. Obviously the mechanic did not flush the system. So at this point I know I need at least a compressor, evaporator, and expansion valve. Now to the larger of the two problems. I have no power at the compressor plug. A trusted mechanic told me he tried jumpering the switch on the evaporator to no avail. What else is there on this system? Does anyone out there have a schematic? In the archives I noted one fellow had knocked a wire loose under the glove box which gave him similar symptoms but he did not elaborate as to what exactly he was talking about. I have not had the time to dig into the old girl yet, but any information would be greatly appreciated. Thanks - William Oh yes the car is a '83 W126 With 617.953
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1983 Mercedes 300SD 1987 Mercedes 300SDL 2001 VW Passat 2.8 AWD 2007 OM642 Jeep WK 4x4 
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#2
07-02-2007, 11:21 AM
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What about the pressure switch on the drier? Did you check the fuses? Also, did he test for voltage, or just try to jumper to make the compressor's clutch activate?
Yes, you do need to replace the compressor, drier, and expansion valve. Also flush the system. If you are going 134a, get a high/low pressure switch to keep the compressor from running if the pressure gets too high or too low.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K
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#3
07-02-2007, 11:53 AM
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You need to jumper the pressure switch on the drier to see if the compressor switch will work. It's the two wires on the lower part of the drier, not the ones on top. The ones on top are the aux. fan.
Quote:
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Andrew '04 Jetta TDI Wagon  '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#4
07-02-2007, 11:59 AM
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Quote:
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K
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#5
07-02-2007, 12:26 PM
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If your car's ac is like my 87, 260E, then check this post:
http://www.peachparts.com/shopforum/showthread.php?t=158591&page=5 I have put an extensive step by step method to test the a/c from compressor relay socket.
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Saumil S. Patel
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#6
07-02-2007, 02:19 PM
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I believe that my car is not equipped with the CCU (KLIMA as it's referred to in some places). That came around 85 or so.
The mechanic told me he bypassed the dryer switch only (my mistake, not the evaporator!) but did not tell me if the voltage was there. Thanks for the quick reply folks!
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1983 Mercedes 300SD 1987 Mercedes 300SDL 2001 VW Passat 2.8 AWD 2007 OM642 Jeep WK 4x4
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#7
07-02-2007, 02:31 PM
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The SD should have the push button climate selector. That push button contraption is the CCU. Klima relay was intorduced in the 1985 IIRC.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K
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