HVAC wiring

Tiny
SFCUSARMYRET
  • MEMBER
  • 2006 FORD F-150
  • 4.2L
  • V6
  • 2WD
  • MANUAL
  • 120,000 MILES
I have the manual AC/heat with three switches (blower speed, heat/cool, and diverter/on off switch. It is the last one I am having the problem with when I turn it either way the blower will start to operate than a relay will turn it and the lighter, power port off. Turning it back off the relay will reset and power will be back on to these items
Monday, August 13th, 2018 AT 11:05 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Hello,

It sounds like you have a temperature control module that is going out. Here is the blower motor wiring diagrams so you can see how the system works.

The module is under the dash here is a diagram to show you the location I would remove the electrical connectors and check them for corrosion. If the module is bad you will need to get it programmed at a shop which should cost about $130.00.

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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Thursday, April 15th, 2021 AT 1:55 PM

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