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The front blower motor is not working?

Tiny
GERMANSTEVEN
  • MEMBER
  • 2010 FORD EXPEDITION
  • 5.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 197,000 MILES
I replaced the blower motor, resistor, and checked fuses and relays. It seems to me like it is a grounding issue at this point. Any advice be appreciated. Oh, it is the manual climate control.
Saturday, September 21st, 2024 AT 11:02 AM

6 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Sure, the ground can go bad and cause this issue, here is a guide to help you test the ground and power circuits with a test light easy:

https://www.2carpros.com/articles/how-to-test-an-automotive-hvac-system-blower-fan-motor-a-detailed

The G200 ground is behind the right kick panel, here are the blower motor wiring diagrams so you can see how the system works. Check out the images (below). Please upload pictures or videos in your response of any problems so we can see what to help you with.
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Saturday, September 21st, 2024 AT 11:53 AM
Tiny
GERMANSTEVEN
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Thanks. I put a test light on the hot and there is power at the motor. There is no power at resistor. Also the climate control module has power but the switch does not output any to the resistor. Any idea where to look next?
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Tuesday, September 24th, 2024 AT 10:33 AM
Tiny
KEN L
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Power for the blower motor is supplied by the blower motor relay, they just vary the ground circuits. Did you check the HVAC module ground? If the ground is good then the HVAC control module has gone out. Check out the images (below). Let us know how it goes.
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Tuesday, September 24th, 2024 AT 2:16 PM
Tiny
GERMANSTEVEN
  • MEMBER
  • 4 POSTS
Thanks. I have not had time to check further but today I was sitting in my car during lunch and 20 min with the ignition in on position the blower kicked in. I wiggled wires and it still worked. Moved all dials on control module and when I moved cold to hot it turned off. On drive him ac turned on while driving and worked all the way back home. Same result. Moved dial from hot to cold and it turned off.
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Thursday, September 26th, 2024 AT 4:33 PM
Tiny
GERMANSTEVEN
  • MEMBER
  • 4 POSTS
Thanks. I have not had time to check further but today I was sitting in my car during lunch and 20 min with the ignition in on position the blower kicked in. I wiggled wires and it still worked. Moved all dials on control module and when I moved cold to hot it turned off. On drive him ac turned on while driving and worked all the way back home. Same result. Moved dial from hot to cold and it turned off
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Thursday, September 26th, 2024 AT 4:33 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Okay, if the ground is good it looks like the HVAC control module is bad.
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Friday, September 27th, 2024 AT 10:47 AM

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