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  #1  
Old 10-12-2003, 10:20 PM
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Location: California
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What would cause the AC compressor to suddenly stop working?

One day the AC was working just fine, and today the compressor won't kick on. What gives? The car is a 87 300D which *unfortunately* was converted to R134A. I'd love to covert it back to R12 some day...
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  #2  
Old 10-12-2003, 10:47 PM
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the compressor has a low pressure switch chances are that kicked in and disconnected the clutch on the compressor.
m
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Martin Ingram
Colorado Springs
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)
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  #3  
Old 10-13-2003, 12:55 AM
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Do a search on Klima relay and then on ice cube relay.

Sixto
95 S420
91 300SE
87 300SDL
83 300SD
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  #4  
Old 10-13-2003, 08:11 PM
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I jumped the two wires at the pressure switch, and the clutch "clicked". So I guess that the switch is bad. Funny how the AC was working perfectly just two days ago.
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  #5  
Old 10-13-2003, 09:57 PM
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I doubt the switch is bad, rather you are low on freon. check for bubbles in the receiver/dryer glass. If you have them you need freon.
m
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Martin Ingram
Colorado Springs
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)
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  #6  
Old 10-14-2003, 03:48 PM
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OK. Now I'm a bit worried. I connected the can to the low side... switched the AC on, and proceeded to charge the system. The needle on the gauge read into the OK area as I was charging the system but when I let off the button on the can, it read the same as it was BEFORE I charged the system - which is ZERO on the gauge.

I really don't know how accurate the thing is. Should I spring for another can or look deeper into the system?

This leads me to think that either 1.) I did something really really wrong or 2.) There is a BIG ugly leak that suddenly sprang up overnight.

I should add that when I jumpered the wires at the pressure switch, the clutch "clicked" but the compressor did not switch on.
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  #7  
Old 10-14-2003, 04:05 PM
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Join Date: Oct 2002
Location: Colorado Springs
Posts: 481
when you say the compressor did not turn on do you mean it was not spinning, cause if the clutch engaged then the compressor is turning. If it does not turn the compressor is siezed however, the belt would then break or squeal until it did. I would recommend you have it looked at cause the AC is very expensive to fix if you screw it up.
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Martin Ingram
Colorado Springs
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)
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