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  #1  
Old 06-02-2007, 07:17 PM
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Join Date: May 2007
Location: Plainfield, Il.
Posts: 34
1983 300sd a/c not working

I have just got done installing a new a/c system according to the dieselgiants write-up and info I searched for on this forum.
Now my problem is the a/c compressor wont turn on. I charged the system with r12 by having powered up the temp/press. switch wire. A/C is ice cold inside when I have the compressor jumped out.
I have searched on here and have read posts abou a KLIMA relay? I also read that it was only installed on 85 and up cars?
I also read about the CCU switch on the dash. Mine seems to act a little funny sometimes. It will let more air out of the defrost than the dash vents.
If anybody has any info. much would be appreciated.
Thanks,
Tony
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  #2  
Old 06-02-2007, 07:31 PM
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Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
This vehicle has no Klima.

A 12V signal comes from socket #6 on the CCU.

This signal passes through the ETR switch on the evaporator. When the evaporator gets too cold, this switch opens and the compressor relay opens.

If the ETR switch is closed, the relay should close.

The load side of the relay then goes through the pressure switch on the drier. If the pressure is too low, this switch will open and the compressor clutch won't get 12V.

So, your issue is the CCU, the ETR switch, the relay, or the pressure switch on the drier.
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  #3  
Old 06-02-2007, 08:13 PM
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Join Date: May 2007
Location: Plainfield, Il.
Posts: 34
Dumb question but where is the compressor relay located?
Pressure switch is new.
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1983 300sd 150,000 miles on her (wifes)
1997 dodge ram 2500 cummins turbo diesel 550rwhp with a set of twins ready to go on.
2005 Audi A6 2.7T Sline Quattro
1998 30' Four Winds
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  #4  
Old 06-02-2007, 08:53 PM
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Join Date: May 2002
Location: Blue Point, NY
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Quote:
Originally Posted by tony597fitter View Post
Dumb question but where is the compressor relay located?
Pressure switch is new.
As you face the fuse box from the driver's side, the relay should be the second from the right side in the first row (closest to you).

I say "should be" because it's title is "compressor time delay relay". I can't find any other relay that operates the compressor, so, I'm concluding that this is the one.

Maybe Bruce can confirm..........??
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  #5  
Old 06-02-2007, 11:22 PM
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Join Date: Aug 2006
Location: Tampa
Posts: 195
thanks Brian
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Brian

82 300d turbo 164k - passed on
83 sd - passed on
04 civic hybrid - DD
06 GTO for sale - passed on
84 VW Rabbit Diesel 4dr.- passed on
94 S350D - DD
94 S320 - soon to be DD
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  #6  
Old 06-03-2007, 01:28 AM
Parts Breaker
 
Join Date: May 2007
Location: Plainfield, Il.
Posts: 34
Thanks Brian,
I just got in from the garage. Been doing shocks, brakes, new bearings, motor mounts and shocks, steering stabilizer on the 300sd.
Back to the A/C in the morning.
__________________
1983 300sd 150,000 miles on her (wifes)
1997 dodge ram 2500 cummins turbo diesel 550rwhp with a set of twins ready to go on.
2005 Audi A6 2.7T Sline Quattro
1998 30' Four Winds
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