Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive P2 platform cars sold as model years 2001-2007 (North American market year designations).
Your car does not have a heater control valve, that is only on the early cars. It could be something as easy as a software upgrade for the CCM. It also could be the temperature control damper motor or the linkage at the motor. Does your car have electronic climate control?