Replaced ecc unit from salvage yard today. Everything is working correctly. ECC unit was the problem.

What thermal fuse do you speak of? By the way, I never experienced the obligatory A/C and REC flashing lights on the ECC unit.

Pauloil,resistor pack is new (purchased from Volvo Dealer OEM). Cleaned cabin temp sensors, same symptom. Pulled blower fan, cleaned and lubed, same symptom. Nikolaj, dash temp gauge reads normal, thermostat was a guess and I really don't suspect it as the cause of the problem. I feel I need to rest...

I need your help! I have a 95 850 turbo. about a week ago I started having issues with the ecc climate control. I had no control of the blower motor (on high all the time the engine was running). auto, 0 or any variation of blower speed made no difference. At first I was getting all heat through the...