I have a wierd (at least it seems wierd to me) problem with my A/C on a 850 with 244,000 miles and in otherwise good working order. During the summer -- when it is needed the most -- the A/C will not run consistently. It will blow cold for five, 10 sometimes as long as 30 minutes and then stop cooling. If you turn off the A/C for five minutes or so and turn it back on it will be cold again for a little while and then stop working again. It only seems to happen when I'm driving and the coolant level is in the "good" zone of the pressure gauge I bought to check on that. The thing that really boggles my mind is that on a recent rainy day when the temperature was not as hot, but I needed the A/C to dehumidfy the car, it worked for my entire 60 minute drive home.

Does anyone have any ideas as to what may be wrong? None of the repair shops I call will even guess as to what may be wrong and I don't want to take it in until I know whether it may be something as small as a bad pressure switch or as big as the compressor going out. I'd appreciate any advice and/or stories relating to similar situations.

Jim