Quote:
Originally Posted by saumil
You should get a low resistance between pins 9 and 11. So yes either the sensor is open or you have a broken wire somewhere.
Now since we are finding car based differences, you have to make sure that your compressor has a speed sensor and that the wires of the sensor arrive at the pins 9 and 11. To double check, verify connectivity between sensor connections at the compressor and pins 9 and 11.
This finding fits very well with your symptoms. And if you do find that the compressor speed sensor is broken, I am not sure what you can do about it. You have to call the dealer and see if they can just replace the sensor for you, it is a serviceable part but may be so old that it is not available anymore. Otherwise, will need a new compressor.
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I've found that the speed sensor is located on the back of the compressor. My usual supplier has them (approx. US$70). It has white and red wires leading from it to a harness on the top-front of the compressor. On top of those is another set of wires - blue (was dirty, might have been green), red and white. The white and red went to slots 9 and 11 (can't recall which was which). But (this seemed odd to me) each (red and white) showed essentially no resistance to its own slot (which is how I determined slot ownership), and only limited resistance to the slot of the other - perhaps that is how it is supposed to work?). I don't know where the blue/green wire goes. There is also a black wire in the mix, which appears to be a ground.
But here is an odd thing. As I was trying to check these for continuity, my results kept changing. Then I plugged the Klima back in, and the A/C worked for a minute or two. Then I checked continuity again (showed fine). I plugged the Klima back in, and the A/C started working and didn't stop this time (several minutes of A/C - what luxury!)
So now I'm thinking that I have a bad/dirty connection or a weak wire down at, or around, that harness on the top-front of the compressor. Testing there (nudging wires and such) seems to change my results and the run/not run condition of the compressor. Either that, or perhaps an intermittent problem in the sensor (belt tension seems fine, so I'm ruling out that the sensor is actually doing its job properly).
I'm going to go out now and clean the contacts, make sure the connections between the wires and the harness look good, etc., and see if that fixes the problem.
-Brett