Blower fan will not turn off

2008 NISSAN TITAN

80,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC

JOE WHITEHURST

MEMBER
1 POST

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.

Sep 4, 2017 at 5:02 PM

STRAILER

✓ASE Certified Mechanic
54,832 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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Professional Diagram for 2CarPros Members
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Sep 5, 2017 at 4:16 PM