Originally Posted by weird beard

1982 300sd. More often than not, i have no blower motor. No function when high or low selected on fan speed. Occasionally works when in automatic mode or defrost. Never stays working for more than 5 minutes. Usually only works when car is first started. Given the symptoms, I am pretty sure the ccu has bit the dust. I am going to try to pick a used one, any other possibility's or more common failure points?