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Slowly failing climate control unit Topic is solved

Help, Advice, Owners' Discussion and DIY Tutorials on S40 and V40. In this forum you'll find S40/V40-specific owners asking and answering questions on maintenance, ownership, repairs, tutorials and almost every do-it-yourself thing you can do to save money owning these Volvos.

1996 - 2004 S40
1996 - 2004 V40

nsomlai
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Year and Model: 2000 S40
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nsomlai

Slowly failing climate control unit

Post by nsomlai » Thu Nov 10, 2016 3:47 am

My 2000 S40's climate control unit has been failing for over 5 years now. It takes longer and longer to set the proper air temperature blown into the cabin. Now it takes 30 minutes so I asked the official garage for a diagnosis and they confirmed that the signal does not get to the servo of the air mixing valve. I also made the mistake of asking the price of a replacement (US$ 1000), still recovering from the shock. :)

My guess is that there is a loose electrical connection (soldering or cable) somewhere and the warmth of the engine makes it better. Do I stand a chance trying to find that?

My other option is to buy a used one. Is it easy to pick the right one on Ebay just by photo? Or are there identically looking modules with incompatible electronics? Or if the buttons and knobs match, it will be good for me? How about ones with Fahrenheit scales but otherwise identical? I found a few of those.

difflock54
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Year and Model: V40 Nordic 2002
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difflock54

Re: Slowly failing climate control unit

Post by difflock54 » Thu Nov 10, 2016 4:24 pm

I read on another volvo forum just today that problems with the climate control unit can sometimes be sorted out by a cleanup of the contacts with an electrical contact spray. Might be worth a try?
Using a 2nd hand unit with fahrenheit calibrated knob should work fine as the unit itself will not be different.

nsomlai
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nsomlai

Re: Slowly failing climate control unit

Post by nsomlai » Thu Nov 10, 2016 11:07 pm

Thanks, I obtained an old Vadis copy and the part number for Fahrenheit and Celsius is the same. Unfortunately there are more modules available on Ebay with no seat heating and DSA, this full-fledged version seems to be more rare. (Although I don't remember ever using the DSA off switch in 16 years.)

Yes, the service guy agreed that it may be a loose connector or soldering point that works better after the cabin gets warm. I'm considering taking it out and try my luck with contact spray and re-soldering suspicious points. The problem is that winter is coming and if I ruined it completely and couldn't find a new one quickly, I would need to get around without heating.

cbburtraw
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cbburtraw

Re: Slowly failing climate control unit

Post by cbburtraw » Thu Dec 01, 2016 4:59 pm

These units are pretty unique to the old 40 series. I doubt you'd mix em up with another model.

I'd definitely check the connectors. Maybe hold of on taking the unit itself apart until spring if you're worried about losing it.

Mine seems to not work here and there... full heat or no heat sometimes. Not often enough to warrant tearing it up just yet though - thankful for heated seats. Let me know what you do if you fix it.

nsomlai
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nsomlai

Re: Slowly failing climate control unit

Post by nsomlai » Thu Apr 27, 2017 12:59 am

Things continued to get worse (fan speed control also started to work interemittently) so I ordered a used unit off ebay. I planned to install it myself, but then I read about damper motor calibration. This is a used ECC so I guess automatic calibration will not work, it should be initiated manually from VIDA. And I don't have the software.

Will it do any damage if I use the unit without calibration until I get to a repair shop next time?

nsomlai
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Year and Model: 2000 S40
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nsomlai

Re: Slowly failing climate control unit  Topic is solved

Post by nsomlai » Tue May 02, 2017 1:41 pm

Replaced the unit. The new one works OK. Will pop into the local shop for calibration tomorrow.

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