Question about 1997 Volvo 960

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A/C only blows cold for 20 minutes

I have a 97 Volvo 960. After sitting for a couple of hours, or overnight, the A/C blows cold for about 20 minutes, then goes to warm air. I took it to the local import garage, who does great work. They pumped out the freon and replaced it with the required amount in case it was low. I picked the car up last night and after heading toward home it started blowing warm air again after 20 minutes or so. They told me to bring it back so they could check some sensors.
Has anybody had an issue like this with their A/C?
Thanks

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Check the followings:
1. Pressure Switch connection - under front right hand side near lips.
2. Thermostat Switch connection - at the dryer under the hood
3. Retrun Valve maybe blocked - in the cooling pipe from the compressor
4. Cooling Thermostat in the compressor itself.

Posted on Jun 05, 2009

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Posted on Jan 02, 2017

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This does not seem logical as the AC compressor is run off of a belt attached to the engine. If you hear the fan spinning and can hear the relay click when the AC is turned on, it is engaging properly. If you run the AC full blast for about 10-15 minutes and look under the hood you should be able to find the lines for the AC and see some condensation on one portion and feel heat coming off the other portion. The AC line should be a relatively thin silver colored pipe with 2 fittings on top, one high pressure and one low pressure. Assuming everything is running as it should, and the AC is simply not cold (which is the most common problem), you can buy an AC recharge kit at your local auto parts store. Depending on the year of the car, you may need to bleed the system of the old refrigerant as they changed the standard freon used in recent years. The only moving parts in the system are the fan and compressor, so if there is a drop in speed, it will be one of these components.

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