Still sorting out the small bugs in my new-to-me 240D. I love the manual climate control (verses the push button debacle in my 300D) but it has a peculiar quirk. Most times when I move the blue temp wheel to the cool area and turn on the fan, the fan comes on in fine order but the compressor does nothing and blows just ambient air.....however a while later driving down the road I may try again and feel the compressor kick in and the cooling begins. I thought at first that perhaps the compressor would not engage because of the low pressure switch but surely it wouldn't come and go as it's doing. The only thing I could find by searching related to this problem was that the ignition key sometimes affects the climate control. Any help on this intermittent problem?

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85 300D 107K present
82 240D 190K present- next-to-slowest car I ever owned
81 240D 1995-2000- slowest car I ever owned
79 350 SE Euro 1996-2001- fastest car I ever owned