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  #1  
Old 04-15-2006, 06:51 PM
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Join Date: Apr 2006
Location: tx
Posts: 55
Unhappy A/C Expert Needed....

I have a problem with my 89 190E 2.6L gas/auto.

The A/C compressor wont come on at all. Heres the story:

Bought the car, pulled the Klima relay, it smelled like burned electronic crap, i put it back on.) I hook up A/C gauges (cant stand that hi side connection port location) vacuum for .5 hour. Charge 2.2 lbs or R134a. Set controls for Sno-Cone and the compressor comes on for maybe 8-10 seconds, then shuts off. I pull the Klima, its still stinks (of course, its the old one) I take one off another 190E i have that smells delightful and I know that one works Hook it up to the subject car and the comp comes on for 8-10 seconds and conks out. I shut it all down and the relay stinks like burned electronic crap (yeah, the good one) So I pull apart the new and old one and see that the tracing on the board from pin 15 to the black side of Diode 1 is toasted. Both of them.
What gives?

I am considering a soldering repair. Can someone aid here. I dont want to burn new relays. PS I have checked the belt tension and it is super with a new belt. When the comp did run, it wasnt noisy.

Attached Thumbnails
A/C Expert Needed....-burned-relay-1.jpg   A/C Expert Needed....-burned-relay-2.jpg  

Last edited by prevost3000; 04-15-2006 at 06:58 PM.
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  #2  
Old 04-15-2006, 07:32 PM
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Join Date: Apr 2006
Location: tx
Posts: 55
Earning his wings....

Ok. me again.

I went to braingears and looked at the tempmatic schematic. Turns out pin 15 is the positive voltage into the klima. I believe it was overloaded by a bad electrical coil on the ac comp clutch. I measure from pin 87 of Klima to ground, and got 0.07 ohms. I unplugged the 3 pin connector at clutch and it went open, replugged and 0.07 again.

That value sounds like a shorted coil to me, Please correct me if I am wrong. Oooo...you know what, I will go and test my other car, hang on....

EDIT: Yep....the other car was 4.3 ohms. Time to find a coil and a Klima. Learn from my mistake, dont smoke a klima, measure from pin 87 to the battery ground and see if the ohms are Ok. I will try to solder a short wire onto the board and see if it's ok. That thing ought to have a fuse in the top of it like the OVP. Suggestion...Hint, Hint.

PS - How do you get the clutch off the compressor? Can I do it laying underneath the car with the belt off?

Last edited by prevost3000; 04-15-2006 at 10:01 PM.
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  #3  
Old 04-17-2006, 08:05 AM
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Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Excessive draw from the clutch.. should be 4-6A static draw MAX!

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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