my heater is working sporadically.. i bought this car 2 weeks ago and the heater works maybe 33% of the time. sometimes the fan won't spin at all, and other times the heater works perfectly fine..

i used the diagnostic box (b-1) under the hood and got the following codes

1-2-5
1-2-6
1-3-5
2-1-1
2-2-1
2-2-2
2-3-6
3-2-1
4-1-1
4-1-3

--------

1-2-5 ....... Pass. Side Temp. Sensor Circuit Shorted To Ground
1-2-6 ................................. Pass. Side Temp. Sensor
1-3-5 ........................ No Engine Temp. Frequency Signal

2-1-1 .............. Driver’s Side Damper Motor Position Sensor
Circuit Open Or Shorted To Power
2-2-1 ................. Pass. Side Damper Motor Position Sensor
Circuit Open Or Shorted To Power
2-2-2 ................. Pass. Side Damper Motor Position Sensor
Shorted To Ground

2-3-6 ..................... Recirculation Damper Motor Position
Sensor Shorted To Ground

3-2-1 .............. Driver’s Side Damper Motor Active Too Long
4-1-1 ......... Pass. Compartment Fan Overcurrent Or Seized Fan
4-1-3 .............................. Driver’s Side Temp. Sensor
Intake Fan, No Control Voltage

if that's any help to you guys

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any help would be greatly appreciated. thank you

 

Well, if I were you, I would visit the junkyard and replace the controller. But before I did that, I would probably pop it out and jiggle all the wires and make sure it looks good. I doubt that'll help it.


all those items aren't separately shorted to ground, as I am sure you know. The problem is in the brain, which is the only place these things are combined.

 

yeah picked one up at the junkyard for $50 and the heater is working now. thanks

 

Good job! Thanks for posting the resolution.

 

it stopped working again today.. i turned the car off then turned it back on and it was working again, now it's giving me codes

2-1-1
4-1-7
4-1-8
1-2-4
2-1-1

 

Volvo 850 ECC climate control AC & heater system service manual

Its a good place for the 4-1-1 on your 2-1-1...