'99 S70 - One side of dual climate control stuck on heat

GeoP · Post by **GeoP** » 21 May 2018, 10:45

My '99 S70 is still running like a champ, however, my passenger side climate control is stuck on heat. I bought a new ECC thinking that would fix it, but no luck. Even when the controls are on A/C, the passenger side blows hot air. Is there a fix I can do at home before I shell out a lot of money at a repair shop on a 19 year old car?

Here's a link to my ECC. Hopefully this answers any questions about what my climate control type is.

https://www.ebay.com/itm/Temperature-Te ... %7Ciid%3A1

Thanks!

Post by **joejoethedogfaceboy** » 21 May 2018, 11:31

Could be one of the damper motors. Had the same problem with one on my '99 S70 last year. I got a replacement from the local junk yard.

viewtopic.php?f=1&t=60451

Do you have access to a VIDA/DICE? There's a test/calibration you can run that will confirm if that is the issue.

-Joe

Post by **misha** » 21 May 2018, 16:04

Or it could be bad shaft for damper motor that needs zip-tieing.

Post by **scot850** » 21 May 2018, 19:35

The damper/servo motor you need to get to is hidden on the RHS of the center section of the dash. To access it you need to remove the glove box liner and then you can drop the lower under dash. You will need a lot of patience and swear words as sell as a magnetic Torx driver to access the 3 small Torx screws that hold the motor in place. If you are trying to find one in the junkyard, then the one that controls the cold air damper which is behind the fan motor is the easiest to remove. It has only one Torx screw at the top front holding it in place, and you can slide the plastic arm off and is should come out easily.

Neil.

Post by **FLXC90** » 21 May 2018, 22:53

scot850 wrote: ↑21 May 2018, 19:35 The damper/servo motor you need to get to is hidden on the RHS of the center section of the dash. To access it you need to remove the glove box liner and then you can drop the lower under dash. You will need a lot of patience and swear words as sell as a magnetic Torx driver to access the 3 small Torx screws that hold the motor in place. If you are trying to find one in the junkyard, then the one that controls the cold air damper which is behind the fan motor is the easiest to remove. It has only one Torx screw at the top front holding it in place, and you can slide the plastic arm off and is should come out easily.

Neil.

Neil, can you post a link to where you get your swear words, mine are getting worn from overuse LOL

redc70 · Post by **redc70** » 22 May 2018, 09:37

These have always helped me while working on my Volvo. https://hejsweden.com/en/swedish-swear-words/
I have another list though not extensive for working on the Mercedes!

GeoP · Post by **GeoP** » 22 May 2018, 10:52

You guys are too funny. My husband uses his share of English words. Guess he might just be learning a second language! I will share your repair suggestions as well. He's a pretty handy guy and no doubt will chase it down with your help.

GeoP · Post by **GeoP** » 22 May 2018, 10:53

Joe, what is a VIDA/DICE? Code reader?

Post by **scot850** » 22 May 2018, 11:34

There is a whole separate section in MVS covering just that:

viewforum.php?f=40

Basically it is possible to buy for $150 or less an interface unit (DICE unit) that sits between the OBD2 outlet (where info on the car systems can be read) and a suitably equipped laptop. Until recently you were stuck with using IE8 and Windows 7 Pro, but now there are versions and help that can get it to work on Win 10 and newer versions of IE and maybe Chrome.

What this system does is copy what the dealer does and allows you to interrogate the car's systems to figure issues and that includes the heating and A/C system. It will also help diagnose any other system in the car for 99- years of Volvos.

98 and older models need a different solution to figure stuff out.

These systems are available on Ebay and come from China. Check in the forum for suggest best supplier.

Neil.

Post by **rguzz** » 22 May 2018, 17:14

Mine was exact same issue, passenger side, as stated above, broken plastic sleeve on damper motor shaft. Repaired it (on line search) still good a year later, anyway. Easy fix and easy to get at.