Blower motor will not stop until I disconnect battery

Tiny
RICK WATZ
  • MEMBER
  • 2002 FORD F-150
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 209,000 MILES
Will not stop until I disconnect battery and reconnect. All controls work when truck is running. Radio turns off sporadically. Rain seems to cause the trouble.
Saturday, October 6th, 2018 AT 10:41 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Hello,

It sounds like the blower motor relay is stuck on. Here is a wiring diagrams so you can see how the system works and a guide to help you test the relay with the relay location as well:

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

Check out the diagrams (below). Please let us know what happens.

Cheers, Ken
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Monday, October 8th, 2018 AT 10:41 AM

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