Front A/C only works on High?

2017 FORD EXPEDITION

137,000 MILES • 3.5L • 6 CYL • TURBO • 2WD • AUTOMATIC

BVULGAMORE

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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...

Oct 25, 2022 at 5:14 AM

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STRAILER

AUTOMOTIVE REPAIR CONTRIBUTOR
54,178 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.

Images (Click to enlarge)

Oct 25, 2022 at 11:29 AM

BVULGAMORE

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2 POSTS

I will check the fuses this afternoon. Yes, the fan speed controller as shown above is what I replaced.

Oct 25, 2022 at 11:32 AM

STRAILER

AUTOMOTIVE REPAIR CONTRIBUTOR
54,178 POSTS

Was there no change after the replacement?

Oct 26, 2022 at 10:14 AM