Question about 2006 Volvo S40

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The car has been in the shop for a week. mechanic can not figure it out. AC runs fine at idol but when you drive it for about 20 minutes it will only blow hot air. When you stop and turnit off and wait awhile it work again but after a few only blow hot air. Mechanic says everything maecanically is fine.

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If there is a restriction in the a/c system, the pressure may be getting either too low or too high for system to work properly.

Also, if the charge is low, the compressor may not turn on 20 minutes into your trip.

Check to see if the pressure on the low side is 25 psi to 45 psi when running the a/c.

Good luck.

Posted on Jul 05, 2010

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Posted on Jan 02, 2017

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