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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
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Monday, August 13th, 2018 AT 11:05 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 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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