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Heat air blower fan

Tiny
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?
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Monday, March 12th, 2018 AT 10:00 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 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
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Tuesday, March 13th, 2018 AT 12:05 PM
Tiny
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
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Tuesday, March 13th, 2018 AT 2:20 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Nice work, we are here to help, please use 2CarPros anytime.

Cheers, Ken
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Tuesday, March 13th, 2018 AT 2:26 PM

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