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Volvo 850 t5 aircon works fine on the open road, in town it works for 5 minutes then blows hot air. if you turn it off for a while the it works fine for another five minutes
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I had the same problem (during Summer!!) - If you take the Fan/A.C/Temp Control panel off, you'll probably find the plastic bracket that the control cable mounts to, is broken. I just used 3 zip-ties to hold everything in place. 30 minutes work, & 50c parts!! No problems since.
Low on coolant would be my first guess. Does the temp gauage go up to middle, normal range?Should have a low coolant light on dash, but sometimes the sensor is diabled or broken. I would relace the t-stat and the sensor next to the t-stat housing. Tou will need a 40 torx to get the t-stat off.
sounds like a vaccum diaphram may be leaking try listening for hissing noises under dash near the glove box,set blower to lowest setting\off if you can and still have a\c on.
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