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S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General Forum for the P2-platform S60 / V70 / XC70 / S80 models |
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Heater stuck on hot - drivers side onlyViews : 1169 Replies : 6Users Viewing This Thread : |
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Mar 5th, 2019, 19:43 | #1 |
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Heater stuck on hot - drivers side only
Right oh knowledgeable people...
The heater on my V70 is playing up, passenger side works as it should. Driver side is on heat if the temperature is set to anything but cold (blue). Vida shows no errors, bar the AQS and the damper motors appear to be moving as expected. Sometimes there is a mechanical knocking from under the dash. Suspect something is broken in the heater, but absolutely no idea where to look. I'll be grateful for any pointers. Cheers |
Mar 5th, 2019, 21:21 | #2 |
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Last Online: Dec 26th, 2021 13:42
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Location: Crewe
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Have you done a CCM recalibration in Vida?
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2002 S60 SE D5 Manual 209000 miles |
Mar 7th, 2019, 04:50 | #3 |
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Last Online: Jul 26th, 2021 21:24
Join Date: Jun 2013
Location: Coldnada
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Try the recalibration as mentioned above. One side is reading the cabin temp sensor, while the other side is extrapolating from the other's side temperature button position. Blow some air onto the temp sensor as well (the thing behind the grid near the heat button, don't touch physically)
This temp sensor may also have an issue but try cleaning it in the first place https://www.youtube.com/watch?v=riC13zbjdgg
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Several Volvo Repair Videos https://www.youtube.com/playlist?lis...ECTts0FSVSOT_c |
Mar 7th, 2019, 14:23 | #4 |
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Been working away so wasn’t near the car when I posted. Haven’t tried the recal as I can see the damper motors to be approximately on the same position between the 2 sides and moving as the temperature changes.
Back home now, so will try a recal later as it can’t do any harm. It’s the physical knocking it’s making that makes me think something may be broken internally. |
Mar 7th, 2019, 15:09 | #5 |
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Last Online: Dec 26th, 2021 13:42
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Also, view the cabin temperature sensor reading to see if it is credible within CCM parameters.
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2002 S60 SE D5 Manual 209000 miles |
Mar 23rd, 2019, 00:53 | #6 |
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Sorry it’s been a while updating this, not been using the car.
As expected, the recal in Vida didn’t have any effect. The motors are showing what I’d expect. I think a flap or something has jammed or broken. Anyone know where to look? Is the heater box reasonably easy to change if the dash is out? (Done that before on an old s60). Cheers |
Mar 23rd, 2019, 05:07 | #7 |
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Last Online: Jul 26th, 2021 21:24
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Location: Coldnada
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This is how the CCM sounds when it's working, maybe it helps https://www.youtube.com/watch?v=cbFp7udMxks
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Several Volvo Repair Videos https://www.youtube.com/playlist?lis...ECTts0FSVSOT_c |
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