Question about 1999 Volvo V70

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A/C only works while I am driving

My 2000 S70 Works fine gdriving down the highway or at normal driving speeds. However, when i stop at a light for more then a couple of minutes the clutch disengages and will start blowing warm air. When I get back up to speed it starts cooling again. A/C is fully charged with proper pressure levels and while A/C is blowing the radiatore fan blows non-stop. Any ideas?

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  • gspence157 Jun 23, 2009

    This is a reletively recent change in the way the system performed, it started in 2008. Before then it worked fine, in might have gotten slightly warmer but was not noticable until 2008. We've checked everything and the only possible diagnosis to this point is either the clutch assembly is faulty(I don't think itis this one becuase until the underhood temp goes up it works fine) or it's not getting enought air. I can raise the hood and let is run and run (idle) at normal operating temperature and it will never disengage or blow warm. Only when the hood is down and we are at a stop light... When I hook gages up to the low side it will show between 80 and 140 psi when the car isat normal operating temp... I'm am truley at a loss for ideas...

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This is a characteristic of R-134a. The cooling efficiency at idle has improved slightly over the years with design changes to the hardware but performance still lags that of R-12.

Due to small size radiators and thus reduced coolant capacity in use in nearly all vehicles today, most manufacturers program the pcm to turn the cooling fan on when it sees an a/c "on" signal. This is to prevent overheating of your vehicle as well as keep air moving across the a/c condenser to improve cooling efficiency as much as possible.

While definitely frustrating, the symptoms you describe are not unusual.

Posted on Jun 23, 2009

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