Background info: My AC compressor only engages when the engine is cold. It will work for about 5 to 10 minutes and then the compressor clutch disengages as the engine starts to warm up.

Testing/diagnosis: I followed the procedure in the MB climate control manual and found that the ac compressor speed sensor or wiring may be faulty. I get zero voltage (measuring ac voltage, terminals 5 and 7 jumped) when measuring across pins 9 and 11 of the KLIMA socket. The measured resistance is around 900 ohms. The spec should be 530-650 ohms.

Questions: How does one replace the speed sensor? Does the compressor have to come out? I tried searching the topic but did not find any posts on the topic. Any thoughts and advice?

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2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
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