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A/C intermittant

1991 940 turbo USA. Works good for 2-10 minutes then doesn't, at random, when going 55mph or faster. Seems to work continuously at slower speeds like 35mph.
A/C compressor and clutch are good, belt new and feels as tight as the other belts. Freon (R-12) measures good pressure on the low-pressure side and the dryer is real cold to touch.
It does not have electronic climate control,or any numbers on the A/C knob. Don't know if it uses a cabin temperature sensor. Just turn left(blue)for colder, or right(red)for hotter.
Any ideas? Thanks, ...Al...






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