Blower fan will not turn off

Tiny
JOE WHITEHURST
  • MEMBER
  • 2008 NISSAN TITAN
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
A/C/heater blower fan runs all the time. A/C works when control knob is engaged. Replaced center control unit but blower fan runs all the time.
Monday, September 4th, 2017 AT 5:02 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,070 POSTS
It sounds like you have a blower motor relay that is stuck on, try to remove it to see if the blower stops.

Here are some diagrams (below) and a guide that will help us fix the problem. The relay is #107 in the last fuse box diagram

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

I included the wiring diagrams for both manual and auto system is case we need to go deeper.

Please let us know what happens so it will help others.

Cheers, Ken
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Tuesday, September 5th, 2017 AT 4:16 PM

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