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  #16  
Old 03-15-2003, 06:21 PM
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I am back!

The good news is...I do not have a leak! The system has refrigerant. I took the car to a mechanic friend who has gauges. A/C pressures are OK! However, he has NO MB experience.
The bad news is...I still do not have a working compressor.
It has to be a sensor/electrical i.e evaporator sensor. The book shows a fancy tool to test the PBC including the sensors (which I do not have).
Any other suggestions before I take the car to a MB pro?
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  #17  
Old 03-15-2003, 11:18 PM
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J. H.

I'm confused. How was the low and high side pressure tested if the compressor won't engage? Was the low pressure switch jumped?
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  #18  
Old 03-15-2003, 11:36 PM
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Just to see if I had refrigerant in the system!

Low side has 80 pounds. The engine was off...
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  #19  
Old 03-15-2003, 11:49 PM
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If jumpering the low pressure switch caused the compressor clutch to engage and spin the a/c compressor, you found your problem.
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  #20  
Old 03-16-2003, 10:43 AM
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Mike,

Unfortunately, I already tried jumping the low pressure switch and was mentioned earlier here (probably you missed it). The compressor did not engage. That is why I was hoping (in a way) to be low on refrigerant to find what was wrong. But, like Steve said, I was in doubt that was the problem. It was not.
My possible suspects are: klima relay, PBC, sensor(evaporator?).
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  #21  
Old 03-16-2003, 11:13 AM
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The concept to my replies were to give info for the evaluation of WHETHER it IS the PBC or the Klima. I'm not going to read back through this its your car.

The story IS: the PBC does ONLY one thing in this reguard; it grounds the Klima on the circuit that the low pressure switch is in. (so convenient for testing) Quit thinking about the low pressure switch (you now know that you have pressure). DOES THE CIRCUIT GO TO GROUND WHEN A/C is called for at the PBC? It either does or it doesn't.

DOES the Klima turn the A/C on when that circuit is grounded????? (easily done at the low pressure switch). This whole decision should be verifiable in a minute or two. This is simple stuff!!! Either the PBC doesn't switch the Klima to ground or the Klima doesn't respond when switched to ground. No more complicated than a brake light.

You, no longer, should have any reason for not knowing whether the problem is a dash decision (PBC makes the inside decision) or an engine decision (Klima makes that decision). This job starts with making that decision once there is pressure.
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  #22  
Old 03-16-2003, 09:59 PM
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Steve,

I read and re-read this thread xx times. I also went back to the archives and the climate control manual.

First M.B.DOC said in one thread:
"To determine whether the problem is inside OR under hood, you must see if the pin number 10 on the "klima" relay gets a GROUND command signal from the pushbutton assembly. WITH the car running measure for battery voltage between pins # 5(power) & pin # 10, IF you have battery voltage then the problem is in the "klima" relay." This is step #2 in job 83-605. I got battery voltage.
Second, as I mentioned before, the system passed all the steps in job 83-605 in the climate control manual. However, the next box after passing the last step (#6) says "renew control unit (N6)"or Klima relay.
Third, you said earlier:
"The next readings say that the PBC is pulling the Klima to ground."
Conclusion: I have a bad KLIMA relay.
Thanks for you help and remember you ONLY have 27 years of experience on me!
I will report end result sooner or later to hopefully help somebody else...
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  #23  
Old 03-16-2003, 10:24 PM
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Its often hard to describe a circuit with words.
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  #24  
Old 03-18-2003, 02:38 PM
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Steve, you must be a candidate for sainthood. I'm always amazed by the amount of patience you have with the rest of us.

J.Hidalgo - if you end up taking this to a pro, why don't you go to Steve's shop? It's only a couple hours away from you in Gainesville.
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  #25  
Old 03-18-2003, 10:19 PM
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Mike,

If the Klima relay does not fix my problem. I am there!
After all the advice from Steve I would feel guilty if I don't. Logistics are difficult but not impossible. We will see!
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  #26  
Old 03-20-2003, 09:58 PM
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ITS ALIVE!

I said I was going to post the end result of this thread and here it is...I just got a new klima relay. The AC and compressor is working great!
Thanks again to everybody that put their 2 cents and specially, Steve B. a REAL MB pro.
I hope this helps somebody else in this forum.
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