Help! Similar problem for me this past week- 98 E300 W210
Power to harness on Red and Orange wires but blower motor won't blow when I tested with my test light. (Note: blower does work when hotwired with jumper cables.)
Should there be some voltage on the Yellow wire? (what does this one do?)
Also, the black and blue wires are not grounded, therefore blower won't blow?
Is the problem in the black plastic thing at the end of the harness?
What does the blower regulator do?
Where is the blower regulator (under hood or dash)?
What does it look like?
Help sincerely appreciated (it's 90F now and I'll need the heater blowing before you know it here in NY). Thanks in advance.