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Old 08-12-2010, 04:08 PM
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Join Date: Jan 2001
Location: Alexandria, Virginia
Posts: 5,480
Intermittnt 240D AC Mystery

I have a 1982 240D. The AC ha a peculiar problem.
Sometimes, anywhere fom 5 minutes to a half-hour after the AC is switched on cooling is great. Then it gradually declines over 5 to 15 minutes, until there is none. If I park the car for about a half-hour, it may work fine again, perhaps for the rest of the day. Car has R12, a rebuilt compressor, and new rec-drier. Negligable freon loss since last summer when the work was done.
When cooling ceases, high and low pressure readings are near equal. I suspect a defective expansion-valve that is intemittently going to WOT, but a search here didn't find a similar condition.
What do you think?
Thanks in advance.

Happy Motoring, Mark
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