Heat air blower fan

BILL KIEKEL

MEMBER
2005 MERCEDES BENZ C240
2.6L
6 CYL
2WD
AUTOMATIC
305,000 MILES

Watched your video on remove and replace the blower fan. Mine was not working at all even defrost. Took out blower unit. On floor of car turned on defrost and fan worked. Seemed to also work on A/C. Thought maybe the wiring plug had not been in fully. Put unit back in place and it does not work on defrost or A/C. Do not know what to try?

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,883 POSTS

Hey Bill,

It does sounds like a connection problem does the connector fit well? Also, test the system grounds. Here is a guide and a blower motor wiring diagrams to help us see how the system works:

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

and

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the diagrams (below).

Please let us know what you find. We are interested to see what it is.

Cheers, Ken

Images (Click to make bigger)

SPONSORED LINKS

Was this

answer

helpful?

Yes

No

+1

Tuesday, March 13th, 2018 AT 12:05 PM

BILL KIEKEL

MEMBER
2 POSTS

I removed the blower again and it worked on passenger side floor on all speeds. Put it back in and everything is working properly again. Must have been a connector contact problem. Thank you

Was this

answer

helpful?

Yes

No

Tuesday, March 13th, 2018 AT 2:20 PM

KEN L