2006 V70XC Only warm heat when heater on high.

Bluegrassxc70 · Post by **Bluegrassxc70** » 01 Jan 2018, 13:59

Any idea how to diagnose a blend door or air door probes without pulling the heater core? I did see the motors, cams and linkages move when I had the pass side panels off. Seemed to be smooth, but I have no idea what the full range of Travel is supposed to be.

Post by **abscate** » 02 Jan 2018, 10:33

Added year model to title per posting guidelines - this will also help others who can help you!

zaneallen · Post by **zaneallen** » 02 Jan 2018, 11:01

do the XC’s from that year have a heater core control valve? i know that on my (ancient) 960 it is controlled by vacuum, maybe the higher blower motor setting is opening the valve more?

Post by **abscate** » 02 Jan 2018, 17:20

I’m pretty sure all P2s use full flow heater cores

Bluegrassxc70 · Post by **Bluegrassxc70** » 02 Jan 2018, 19:43

Agree. I am 90% sure there is not a heater core control valve. Coolant is always flowing through it.

Post by **oragex** » 03 Jan 2018, 09:04

It's full flow as mentioned. At the end of this video I had a heater core cut open to check what's inside

Bluegrassxc70 · Post by **Bluegrassxc70** » 30 Oct 2018, 20:18

. It’s been almost a year since I posted about this. Ran out of time to try to fix it so we dealt with it for last winter. Winter is upon us again and I’m trying to resolve this again:)

I was about to buy a new heater core then went out and checked the inlet and outlet tube temps at the fire wall. When set to heat there is a large temp delta between the two. Then when set to cold, both tubes are hot. Seems like I am getting decent heat exchange.... but the air is still lukewarm at the vents. I would love to verify that my blend doors are fully operational. Can anyone tell me how to verify that all of the doors are in proper position when set to max heat? I am wondering if I have some bypas and mixing with other air....

Post by **velorider** » 31 Oct 2018, 01:21

You can verify the bend motor and linkage is operating. Remove the side panel of the center console and kick panel under the drivers side. Just above the heater core you can see the linkage and motor for the bend door that directs air over the core. With the car running adjust the temp from low to high, you should see the linkage move. Then repeat on the passenger side.

Good luck
John

Post by **Rattnalle** » 31 Oct 2018, 02:28

If everything works when in High it's most likely the sensor in the ACC panel. When on High the sensor is bypassed and it runs a fixed program.

It's quite easily replaced with a standard off the shelf component and a bit of soldering if it is damaged in some way. It could also just be full of dust.

Post by **oragex** » 31 Oct 2018, 04:28

At 32:00 you may see a bit how/which side linkage above the pedals is moving to activate the flaps inside

Alao make sure the cabintemp sensor near the passenger temp knob is clear of dust and doesn't look broken, with a flash light - do not touch it

2006 V70XC Only warm heat when heater on high.

Re: Only warm heat when heater on high.