I found an old tech note for your model year describing your complaint for a manuel control climate system. You will need to take it in to the dealership or an independent Volvo repair to do a climate control module software update. The update will also have them do a calibration of all damper motors. If the software is current, then a calibration needs to be carried out. Will post the bulletin for you to print and take with you to the shop.
A/C - Blows Hot Air From One or Both Sides
NO: 87-50 (superseding 87-50 dated 06-30-05)
MODEL: All new S40/V50 (Mostly MY06)
Climate unit, blowing hot air when cold air is requested.
This Tech-net note supersedes the previous 87-50 dated 6-30-05.
Please update your files.
Under certain conditions customers may experience hot air coming out of the vents on one side (ECC) or both sides (MCC) when cold air is requested. On other occasions the air distribution will not function correctly resulting in the fan motor running but all flaps closed for a short time (perceived by the customer as increased fan speed/noise level).
These conditions may occur directly after start-up or randomly during a driving cycle.
The problem is caused by a fault in the MY06 software in the Climate Control Module (CCM).
For affected vehicles that are still in retailer stock, upgrade the cars during CPS or prior to customer delivery following the service method below (step 1 through 5).
For customer complaints with symptoms meeting the above description, perform the following service:
1 Check for Diagnostic Trouble Codes (DTC's).
2) Perform CCM Software upgrade PN 30667207 (if not available, the upgrade has already been done).
3) Calibration of the Climate Control Module.
Good luck and hope this helps you out.
Thursday, October 21st, 2010 AT 12:53 AM