Question about 2006 Volvo S60

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Heater Cycling - 2006 S60

While heating the interior of the car on both automatic or manual modes, the air exiting all of the vents is 4 seconds hot and then 4 seconds cold. This cycle continues until I turn the heater off. Last winter this problem was intermittent, this winter it is consistent. My guess is that there is a controller that allows outside air in to temper the heated air and is malfunctioning by opening and closing the outside air damper resulting in the air coming out of the vents going from hot to cold to hot to cold, etc. My question surrounds the potential of web access to schematics and drawingsthat I could consult to figure out how to correct this. I do not want to replace the entire heating control system if it's something that can be corrected with a little study.

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  • PGall May 18, 2009

    I have the same exact problem! Just bought the car a few weeks ago. Noticed when I use the heat that it cycles through alternating hot & cold for several seconds each. I also noticed a whirring noise coming from the engine area every time the cycle switches. Did you ever find out what was wrong? What did you do to fix it?

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SOURCE: 1992 240 Gl, Windshield air vent/defroster has almost no output

wow...here it is spring and no one answered either of you? Is there a large volume of air when fan is on high? Where is it going? Or do you not hear anything from the fan? The 240 has an awesome heater. On high it would heat a small home! If no sound, your blower motor is dead assuming the fuse is good. If you hear the fan blowing, figure out where the air IS going. Note that the only way to turn the dash vents off is with the white Oreo dials. To defrost, only that button should be pressed in and dash vents off. Behind the dash switches there is a maze of short vacuum hoses. Often times, people monkey w/ these and reconnect them incorrectly. Haynes manual or Chilton's have proper diagrams. It could be that the vacuum hose coming from the manifold and entering the firewall is split on the under side and not visible, also.

Posted on Apr 21, 2009

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