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  #16  
Old 08-13-2007, 03:45 PM
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Join Date: Jul 2004
Location: York, PA
Posts: 621
I just recharged my 1986 190E and the problem I had before is still there. Unless I am moving and the RPM's are off idle my AC works. As soon as I stop and the engine idles my Compressor shuts off and of course has to be reset via turning ignition off and back on. All is well then. If I rev in Neutral and hold the gas at anything over idle the compressor will still work. Any ideas!

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....
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  #17  
Old 08-13-2007, 03:55 PM
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Location: Houston, Texas
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Either the engine speed sensor, the compressor speed sensor (if this car has one) is faulty or belt is loose/slipping on the compressor pulley. When the Klima relay detects a speed mismatch between engine and compressor rpm, it cuts off the compressor to protect the belt. The difference in speeds should be greater than about 30% to activate the cut-off. In the procedure I listed in this post, there are steps to check the voltage signals from these sensors.
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  #18  
Old 08-13-2007, 05:26 PM
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Join Date: Aug 2007
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I will look at the troubleshooting guide I have. I went through the steps to troubleshoot in my troubleshooting efforts. It involves pulling your klima relay, jumping two connectors to force the compressor on (for short term only) and taking a reading between two other contacts. The problem is, i cant remeber which contact is which.
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  #19  
Old 08-13-2007, 08:34 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
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The usual cause for this behavior is a slipping belt. Check the side with the grooves -- if there are cracks or pieces missing from the ridges, you need a new belt, and likely the problem will go away.

Sadly, you will also likely need a new belt tensioner too, a royal PITA.

Peter
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1972 220D ?? miles
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  #20  
Old 08-14-2007, 09:39 AM
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Join Date: Jul 2004
Location: York, PA
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Belts not slipping at all. Funny thing is it actually worked fine yesterday. When it shuts off the pressure on the low side is about 34psi. Maybe I just need a hair more R134! I know the low pressure switch point is 2 bar so maybe it is too close. If I held the RPM's up near 900 ish when at stop lights the compressor never kicked off and I was surprised when I got in the garage and idle'ing that it was still engaged. Also no matter what CC unit I use, have tried three, the darn normal AC button does nothing. Only max AC works. Being that you guys have done more than I have I am wondering if there is an easy answer or not. I will go through the tests over the weekend when I have more time but for now was wondering.

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....
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