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Originally Posted by Arthur Dalton
I do not have a schematic for this chassis , but you may want to consider power feed interuption instead of the switched ground fault.
It is possible that you have a poor connection at the fuse feed or relay connection .
Hook a test light to ice cube coil side and load side and see if power is dropping at the terminals of each.
If suspect , bring a bat+ jumper over to ice cube pos side and run the car for a test .. see if it drops then.
Same goes for ground side .. Run ice cube with its own ground wire and see if you get a drop after the time limit you are getting.
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Arthur, wouldn't the fact that the exact same symptom occurs with the Klima and with the ice cube relay would seem to rule out a poor connection to both of them.
Additionally, a poor connection would give a different time interval than originally noted for the Klima. This symptom is exactly the same, with the Klima in place, or with the ice cube relay in place. Four minutes of compressor operation and then nothing.
I have a suspicion that the CCU might be the problem, unless there is a high pressure switch that I'm not aware of.
BTW, I did confirm unlimited operation of the compressor by jumping 12V directly to the compressor socket in the 12 pin connector. So, if I wasn't worried about freezing the evaporator, I could run the compressor indefinitely.
I'm not seriously going to consider this.
