Mechanics

AC/HEATING NOT SWITCHING BACK AND FORTH.

2006 Volvo S40

Air Conditioning problem
2006 Volvo S40 4 cyl Two Wheel Drive Automatic 99000 miles

I'm having a problem with my AC/heating system somewhere. It is having trouble switching back and forth from air conditioning and heating. I'll have to turn the car on and off sometimes 5-10 times to get it to switch. I live in Texas and this time a year we have big differences between the weather when I wake up (6am) and when I drive home from work (3pm). Huge inconvenience!
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Bryanbenoit
October 16, 2010.



What is the exact problem you are having? Does it stay cold all the time and when you switch to hot it will not change or the opposite? Also is this an electronic climate control system where you can put it on auto and set a certain temp that is just right for you? If it is, what does the outside temperature read on the drivers information screen?

JIS001
Oct 18, 2010.
It goes both ways, just a problem with it switching from one to the other. I don't ever have it set to auto, I honestly don't think I even have an auto setting. If I do, it's a surprise to me and it's a) never on or b) not working. And as I said in the first post, if I turn the car completely off, and back on with it set to what I want. Eventually it seems to change.

Tiny
Bryanbenoit
Oct 19, 2010.
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)
DATE: 08-05-05
MODEL: All new S40/V50 (Mostly MY06)
SUBJECT: Climate unit, blowing hot air when cold air is requested.
REFERENCE: VADIS/VIDA

This Tech-net note supersedes the previous 87-50 dated 6-30-05.
Please update your files.

DESCRIPTION: 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.

VEHICLES AFFECTED: SERVICE METHOD: 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.

JIS001
Oct 21, 2010.