Question about Volvo S40
The Air Blend Door Actuator on the blower housing, under dash, passenger side is stuck or defective. The actuator controls the flow of air from the Heater or AC, depends on your settings, if the door is stuck in between, warm air from the Heater will go thru. In your case, door is open just a little or better said, it is not shut all the way, allowing warm air thru only some of the ducts, that unfortunately, happen to be the driver's side.
Try activating the door by setting he temp control from cool to hot a few times to see if the door actuator will get released, if it does not fix the problem, the actuator will need to be removed for closer inspection and if faulty replaced.
Good Luck!! Don't forget to rate this post!!
Posted on Aug 23, 2010
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Posted on Jan 02, 2017
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