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Volvo 850, 1995, ECC damper motor problems

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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Flow
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Year and Model: 850 1995
Location: Rze

Volvo 850, 1995, ECC damper motor problems

Post by Flow »

Hello, from couple of months i have a problem with ECC damper motors, the air comes only from the front, when i switch to floor or defrost nothing happen, Temp adjustment and fan speed works good
There is two error codes 2-3-1 and 2-3-3.
All damper motors working when i plug them to 9v battery.
I've replaced blower resistor whole electric bundle from control panel to damper motors, interior temp sensor e.t.c. tried 4 different control panels and nothing has change...
Maybe someone had a similar problem and he could advise me something.

Regards and I'm sorry for my English.
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abscate
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Re: Volvo 850, 1995, ECC damper motor problems

Post by abscate »

Dzien Dobry!!

If the motors test out, then probably the control unit is causing a problem
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Flow
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Joined: Thu Oct 05, 2017 3:00 pm
Year and Model: 850 1995
Location: Rze

Re: Volvo 850, 1995, ECC damper motor problems

Post by Flow »

I have 4 control units each of them works the same.
The temp knobs, fan speed, recirculation works but the floor, defrost motors doesn't.
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Re: Volvo 850, 1995, ECC damper motor problems

Post by jreed »

When I looked up the meaning of the 231 and 233 codes I saw that they both have to do with the position sensor inside the damper motor. In my experience this means the dampers need to be opened up and the carbon resistance tracks inside cleaned off. They get covered with grease and stop working after a while.

231 Ventilation damper motor position sensor open circuit or shorted to 12 volts
233 Floor/defrost damper motor position sensor open circuit or shorted to 12 volts
1997 855 GLT (Light Pressure Turbo) still going strong. Previous: 1986 240 GL rusted out in '06, 1985 Saab 900T rusted out in '95, 1975 Saab 99 rusted out in '95, 1973 Saab 99 rusted out in '94
Flow
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Joined: Thu Oct 05, 2017 3:00 pm
Year and Model: 850 1995
Location: Rze

Re: Volvo 850, 1995, ECC damper motor problems

Post by Flow »

I think the problem its not with motors, when i'm take passenger side temp damper motor (which works good) and swap it with defrost damper motor, it's still the same situation, temp motor works, defrost not.
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Re: Volvo 850, 1995, ECC damper motor problems

Post by scot850 »

Check the actual flaps are moving. I had an 850 where the flaps had melted to the internals of the air box and it would not turn. Also check the sleeves at the ends of the flap arms are not cracked. That is a common issue. You can often fix the slit using a small clamp or sometimes a zip-tie.

Neil.
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Flow
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Joined: Thu Oct 05, 2017 3:00 pm
Year and Model: 850 1995
Location: Rze

Re: Volvo 850, 1995, ECC damper motor problems

Post by Flow »

Flaps, shafts e.t.c everything is ok, i can easily turn them by hand when i unscrew the motors.
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Re: Volvo 850, 1995, ECC damper motor problems

Post by sleddriver »

Flow wrote: Sat Oct 07, 2017 10:34 am Flaps, shafts e.t.c everything is ok, i can easily turn them by hand when i unscrew the motors.
I wrote up my experience a few years back, of diagnosing my system. Search for it under my name.
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Re: Volvo 850, 1995, ECC damper motor problems

Post by scot850 »

Check the ends of the shafts where the motors sit into are not cracked. Have you calibrated the motors to ensure they are in the correct positions for open and close?

If the motors move normally when removed from the flaps when the ECC position is changed then the ECC unit is good. Check when you re-fit the motors they are at rest in the correct position for open/close when activated.

Neil.
2000 V70 R - still being an endless PITA
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2003 Toyota 4Runner V8 Limited
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1997 Volvo 850 SE NA - Went to niece in California - Sold
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