Hi,

I have a question concerning how the heater/temperature is supposed to function in a 2006 V70.

The car has dual zone climate control. Each temperature **** is labelled from Blue (lowest), then a range of numbers 18, 20, 22, 24, 26 (celsius, I imagine) etc. up to Red (hottest).

Are these supposed to indicate the temperature of the air blowing out the vent? Or do they indicate the goal temperature of the cabin? Is there a difference between the system being on AUTO versus manual?

One of the reasons I ask is that I hate having still air in the car. I always want a bit of breeze from the vents. However, I seem to only have two choices:

1) The temperature **** is set to one of the numbers (18, 20 etc.) in which case I always have warm/hot air in my face which is uncomfortable and stifling, or

2) The temperature **** is set on Blue (below 18, is the lowest) in which case the vent is blowing frigid air in my face because it's freezing cold here.

How come I just can't get a happy medium between freezing air and hot air? Might there be a problem with the thermostat or the baffles?

Thanks in advance.

 

I have a 04 v70 with the same problem. I posted about it a few times but no one really has been able to figure it out. Keep me posted if you get an idea. Good Luck!

 

I have a follow-up to this issue. For the last month or so, when the fan is on, I could hear the baffle motor cycling back and forth (whirrrrr.....whirrrrrr.....whirrrr) with a period of about 5 to 7 seconds.

I noticed last night, that the air coming out of the vents also switches from cold to hot to cold to hot to cold et....

It does this about half the time. Sometimes it settles down and doesn't cycle or change temperature.

Any thoughts?

 

Same issue with mine. I just sent Volvo an email (although it wont do any good).

 

I have this in another thread that was related but ended up coming to the same conclusion. It is a technical service bulletin published by Volvo. Should be a warranty job.

A/C - Vent Temperature Cycles From Hot to Cold

NO: 87-54
DATE: 11-30-2005
MODEL: S60, S80, V70, XC70, XC90
MY: MY05 MY06
SUBJECT: Temperature Coming Out of the Climate Vents may Start to Cycle from Max Hot Back to Full Cold When Max Hot is Requested.
REFERENCE: VIDA
This Tech-net note supersedes the previous 87-54 dated 11-02-2005. Please update your files.
DESCRIPTION:
If the temperature ***** are turned to max hot, the temperature coming out of the climate vents may start to cycle from max hot back to full cold with a period of 4-15 seconds. No Diagnostic Trouble Codes (DTCs) are stored.
The number of steps on a temperature Damper Motor Module (DMM) may have increased from factory settings, causing the affected DMM to set a "not calibrated" flag to the Climate Control Module (CCM). This causes the climate system to self-calibrate over and over again resulting in the cycling temperature from the vents.

VEHICLES AFFECTED:
SERVICE METHOD:
The above mentioned symptom could be solved by a recalibration of the CCM.
For affected vehicles that are still in retailer stock, upgrade the cars during CPS or prior to customer delivery following the service method in VIDA:
1. Erase CCM DTCs.
2. Perform calibration of the CCM as follows:
- Select the "Diagnostics" tab followed by the "Vehicle communication" tab.
- Click the CCM box.
- Select the "Advanced" tab.
- Click "Checking LIN bus".
- Click "No" if no Damper Motor Module (DMM) has been replaced.
- Read and follow the instructions (to the right) carefully and click the VCT2000 symbol.
- Click the "Start" button (left on screen tool).
- Wait until status "Completed" is shown on the screen tool.
- Regardless of DTCs or no DTCs it is now OK to click the "Hide" button to continue.
- Click the "Continue" button to proceed.

3. Perform functional check of the climate system as follows:
- Start engine.
- Turn FAN speed to MAX.
- Select DEMIST and check airflow to windscreen.
- Select FLOOR and check airflow to floor.
- Select VENT and check airflow to dashboard vents.
- Turn to MAX COLD and check cold air from dashboard vents left and right.
- Turn to MAX HOT and check hot air from dashboard vents left and right.
- Turn temperature and fan speed controls to midrange.
- Select Recirculation and check difference in airflow noise in climate system.
- Switch off Recirculation and check difference in airflow noise in climate system.

4. Use VIDA to read CCM DTCs.
5. If CCM DTCs are present repeat step 1 to 4. If CCM DTCs are persistent after the third attempt, perform fault tracing according to VIDA.

EXAMPLE OF GRAPHIC DISPLAY IN VIDA OF THE PROBLEM

Warranty Claim Information

 

Please try this before you go spend money on parts you may not need. Assuming it is similar..I have a 1997 Volvo 850 GLT..and I had a similar problem. Getting quite frustrated I went and fished out the owner's manual in my glove box. In a Volvo's dual climate control design as per the book, if your switch is set on DEFROST/HEAT, it will blow hot air to the glass and cold air to the interior of the vehicle. This situation also fogs up all the rear windows, or rather it does in my car. If you set the switch to DEFROST/AUTO it will keep all the glass defrosted as long as the AC tab is ON. If you set the switch to the one below the AUTO mode (the guy with the air hitting his knees) then only it will blow warm air into the cab. If you turn the mode switch to AUTO only and the heat controls on heat, then it will automatically send air/heat where needed but AC tab has to be on. Hope this helps.