heater fan
 

here's my question....1990 300TE...heater fan crapped out last year and I put another one in. It worked fine but now it will only engage on ocassion.
Sometimes the fan goes on sometimes it won't. I was told by a local MB Indy shop that the blower resistor can go and that it's located below the glove box. Made sense to me cause the blower motor itself is fine and quiet and all of that. So I go to a U-Pick-Em parts yard (love these things) and lo and behold find a recently resident 1989 300E with the interior in tact.. I go into the glove area and find nothing but this controller with 7 or 8 vacumn hoses and a plug in there. Nothing else but this part and a heater vent hose up in there. It appears as though this part I found is what actuates the vent flaps for the interior air flow. My question, to make a long story short, is....where is the blower motor resistor that control the fan and speed located? It's not under the glove....Thanks

Under the blower motor. If you take out the blower motor again, under that you'll see a triangular shaped part with spikes. That's the blower regulator.

thanks for the response....yeah, that's where the resistor for the BMW fan is, adjacent to the fan assembly itself...makes sense...christ!! i was just in there last fall and it's no fun to go there ...damn it!!... i was hoping against hope but nevertheless....thanks for the info...regards....cliff

by and by...I see you are in Chicago....I'm in Chicago as well....not that it means anything but a strange fall eh? I wonder what the winter will hold....

Have you checked the voltage at the three pins / connector buried above/rearward of the brake booster (12v/variable/gnd)?

no, I didn't do that..why would I do that? what would it tell me? thanks...cliff

I kind of like BSMUWKs' answer myself...thanks to all for the help....cliff

You have three wires: Brown is ground, next is the variable signal from the CCU, and the third is +12vdc. Be sure you have a solid ground and 12v, then try grounding / 12v to the center pin, see if the blower runs fast/slow.

Yes, I will definitely do that. Thanks for the tip...cliff (it's a hell of alot
simpler than the other way)