Great !! Otherwise, if all sensors are o.k., then the problem would move to the Klima relay itself.

The way the speed sensing works is that when you start the car, the compressor is turned on briefly either right when the car starts or after a few seconds (depends on the type of car). Then a check is made for similarity in the speed of compressor and the speed of engine. If the diff is larger than about 30% then the compressor is shut off. And all this takes roughly between 3 to 4 seconds. In some cars, this test is then reperformed few minutes later, I think atleast 3 more times, before giving up until the next restart. This process occurs after every restart.

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Saumil S. Patel