I've got an A/C problem in my '88 750 that hopefully someone can help with. It blows cold, but after 10 minutes or so, the compressor seems to disengage. The only way to get the compressor to come back on is to turn the car off and immediately restart it. But if the car's been siiting in a parking lot, then on a warm restart, the compressor usually won't come on until I've driven the car a few yards, turned it off, and then immediately restarted it. Odd. Again, in all cases, the compressor won't stay engaged for more than 10 minutes or so.

Also, there seems to be some heat intermittently blowing from the windshield and floor vents whether I asked for it or not.

Thanks in advance for any advice!