Quote:
Originally Posted by M.B.DOC
Could be the evaporator temp sensor "probe".
Does the compressor continue to operate when that happens?
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Yes. I;ve observed the compressor-clutch continues to be engaged when this happens. And inside the car, I can feel the engine load gradually decreasig as the cooling declines (I can certainly feel the AC load on this 240D) There's not a sudden change in load, like what normally happens when the AC clutch cuts off.
There's no loss of vent airflow, like what happens if the evaporator fins ice-up. (I did experience that on a W115 220 many years ago, where the temp probe had been pulled out of the evaporator)
And I don't think the intenal expansion-valve port is icing shut, as I believe that would greatly increase the high-side pressure, greatly decrease the low-side pressure, and also increase the compessor-engine load.
Happy Motoring, Mark