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#31
07-28-2010, 08:55 AM
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I have been reading along here and I have a very wild out there question. Have you checked the microswitch that shuts off the compressor at wide open throttle? It is very easy to locate in the engine compartment on the driver's side of the motor. Get someone to sit in the car with the car OFF and push accelerator to the floor. Watch your linkage and at full throttle it will hit a microswitch that shuts off the compressor. Perhaps something is hitting the switch when you drive because you say it works fine at idle. Perhaps the switch is stuck "ON". You can take the switch out an Ohm it to see if it is good.
Just a wild thought.
__________________
John 1986 300sdl 1985 380se 
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#32
07-28-2010, 05:30 PM
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Good call, I'll definitely check this switch out. Thanks
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#33
07-28-2010, 05:39 PM
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Brian, this is exactly what is happening here with my compressor!
I'll try and jumper socket 5 and 7. How big are chances that the relay itself is faulty versus the input parameters? Quote:
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#34
07-29-2010, 12:12 PM
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I checked the microswitch last night.
I tested continuity and the switch works just fine. it works fine Quote:
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#35
07-29-2010, 06:17 PM
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Please jump in and correct me if I am wrong, but here are the things that can make your compressor shut off. Low pressure switch on the drier, High pressure switch on the drier, micro switch for wide open throttle, speed sensor switch on back of compressor, and high coolant temp switch. These are the input parameters for the KLIMA. If all of your sensors are working then it must be a bad KLIMA relay.
Bridging sockets 5 and 7 together on the KLIMA socket will make the compressor come on and stay on. I believe Brian suggested doing this and seeing how your temps are doing. My KLIMA worked perfectly about a month ago when my compressor failed and started to drag and make chirping noises. It immediately cut the power to the A/C clutch and now I have no A/C. I jumpered 5 and 7 and my compressor made a horrible screeching noise and I removed the jumper immediately. I am in the process of purchasing all of the parts I will need to get this working again. Luckily this is not my daily driver because it is pretty hot down here in Louisiana this summer. I figure by mid-fall I will have everything replaced.
__________________
John 1986 300sdl 1985 380se
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#36
08-05-2010, 02:42 PM
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I just wanted to let you know that I replaced my Klima relay by a icecube relay and since then my AC works well. Actually for the first time this summer I enjoy the cold. Before the AC just worked in park on the driveway.
Second issue of vent temps seems to be solved... I measured the initially 60F with a bad thermometer. Since I bought a non contact temp gun I can scan the temperature at the vent and last night after driving and freezing my old thermometer sticking in the vent showed 50F but the laser showed actualy 40F and below (as low as 30F!). I checked also again if the monovalve is doing its job. A good way to test is popping the computer and check temperatures at the heater hose in the firewall underneath the computer. So I believe after recharging R12 and putting icecube in I am back to great AC. Maybe I will try and put a new klima relay in ..because the Klima realy is most possibly the culprit. The icecube is not providing same safety features as the original design. Thanks for all your input. Martin
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#37
08-05-2010, 02:43 PM
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If anyone has a spare Klima relay for testing purposes- please let me know!
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#38
08-05-2010, 10:29 PM
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I have to dig through my stash in the garage. I may only have one for a 617 motor ( 85 300sd ) but I am not sure. I won't be able to get out there till next week. I'll let you know what I find.
__________________
John 1986 300sdl 1985 380se
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#39
08-06-2010, 07:13 AM
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That would be awesome! Martin
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