On my 95 volvo 850 turbo the a/c blows very cold and may do so for hours or only minutes until it blows hot. It may happen 10 times a day on every other day. When it blows cold it is very cold but then it simply blows hot. You can turn off the a/c for approximately 3 minutes and turn back on and it will blow cold again, until it blows hot. It will blow cold every time you turn it off for 3 minutes or so but eventually will blow hot again. I have had it put on computers at three different shops and one said it was the compressor. One said it was a problem in the dash board controls and the third shop said he didn't know what was wrong with it. Do you have any ideas? Thanks Allen
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I have a 1994 Volvo 850 that did the same thing. It was the fuel pump relay, a $50 part that is easy to replace yourself. It could also be the thermostat ($75) in the air flow box. Some people remove the bad thermostat and fix the air flow tube in the position with the air flow coming in from the front of the car. People say you can freeze your engine in winter if you live in a cold climate. It rarely gets cold where I live so it wasn't a problem for me. You do get better gas mileage without that thermostat. I ran my car without the thermostat for about a year and then put a new one in because I started having rough idling problems when the engine had not warmed up yet. The thermostat funnels in hot air from the manifold (?) until the engine warms up and then the spring in the thermostat closes off the tunnel with that hot air flow and opens up the tunnel with the cooler air flow coming in from the front of the car. If the thermostat quits working, the hot air keeps coming in and the engine shuts off after about 10 minutes of driving. The car will usually start right up after you wait a few minutes. These symptoms don't usually show any engine codes.
Hi, I have a 1996 Volvo wagon 850 turbo. I just bought it and when you hold the rpm's at 3 and a half it was blowing out smoke after about 600 miles it stoped smelling like burning oil and doesn't blow out any smoke. But I use a court of oil in about every 150 miles. What could this be?
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.