Makes no sense to me, so I hope someone out there can offer an idea or two. I have searched the forum and don't find this problem addressed.

Just had a compressor, drier, etc. installed. Until the old compressor dies, the AC ran fine.

Now, when I start the engine, no matter what the outside temp, I get good cold air. It's great -- colder that I used to get. I continue to get good cold air until I stop the car. It doesn't matter whether I've driven 30 minutes in stop-and-go traffic or two hours on the highway. If I restart the engine in less that 10 or 15 minutes from when I stopped, i.e. while it's still hot, (like after I stop for diesel) the AC will not cool. The compressor is running -- I can feel the drag on the engine -- but cool air is NOT happening. If I let it sit to cool for a while, I often get the cold air back, but that makes being on time for much of anything a little difficult.

The mechanic who installed the compressor tells me that the magnet in the replacement compressor is not strong enough to do it's job once the engine is hot. At his suggestion, I've tried turning the AC off before I shut off the car, and not turning it back on until the car is running again, and that works perhaps 10% of the time.

None of this makes any sense to me. Any ideas? HELP!!!

Sunny

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Anthracite 1980 300D -- 64k original miles with a new engine, on the road again!
Silver 300D -- second owner, Sunny's old baby, Ilse, 210 miles,
Having to thin the herd….
Silver 1983 300SD -- second owner, 325k miles
Gold 1981 300D -- well-traveled, solid little car
Beige 1984 300D -- 292k miles, grease machine, parting out
Seafoam green 1981 300SD -- 250k, windshield frame damage
too many assorted w123 & w126 cars, parts cars, and extras