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Front A/C only works on High?

Tiny
BVULGAMORE
  • MEMBER
  • 2017 FORD EXPEDITION
  • 3.5L
  • 6 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 137,000 MILES
Hi,

The front A/C recently quit blowing. I replaced the blower resistor, behind the dash, and the resistor connector. Now the A/C will only blow on the highest setting. The resistor was an after-market part from AutoZone. Any idea what is causing the blower to only work on High? I am thinking of replacing the resistor with an OEM part and see if that helps.
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Tuesday, October 25th, 2022 AT 5:14 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,663 POSTS
There are two fuses that run the system we need to check for power, fuse # 32 in the under-hood fuse panel and fuse # 46 in the fuse box in the right kick panel. Here is a guide to help you check the fuses for power:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Here are the blower motor wiring diagrams so you can see how the system works and the fuse location as well in the images below. When you say resistor, you mean the fan speed controller correct? Check out the images (below). Please let us know what happens.
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Tuesday, October 25th, 2022 AT 11:29 AM
Tiny
BVULGAMORE
  • MEMBER
  • 2 POSTS
I will check the fuses this afternoon. Yes, the fan speed controller as shown above is what I replaced.
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Tuesday, October 25th, 2022 AT 11:32 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,663 POSTS
Was there no change after the replacement?
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Wednesday, October 26th, 2022 AT 10:14 AM

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