The compressor runs, but all I get some times is hot air. For example, this morning, cool air. Lunch time - hot air. On the way home this evening, cool air. Got into the car at the mall, all the way home, hot air.
Does anyone have any specific wires, or things to check on the monovalve? I looked at it today, and it was plugged in and the connector looks ok externally (no frayed or broken wires)

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1983 300D (Hans)