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V90 Heater Climate Control Problem S90-V90

posted by  vvpete on  Mon Nov 19 16:42 CST 2012
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last visit: Thu Jul 10 14:10 CST 2014
[RELATED]

There's a control valve against the fierwall that goes out on the 960/V/S/90 but usually results in warm air mixing with cold and can act like the A/C isn't working. There's a PC board under the dash that operates the valve and that also can go bad. Either way it's removal of the dash to get at the valve. A diagnostic from the dealer can tell if the PCB is not working (non-Volvo diagnostic tools won't read the codes)
Another possibility is that thje in-cabin temp sensor is bad which is an easy fix






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