blower works in high only?

2003 FORD F-150
153,000 MILES
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SEVERO
  • MEMBER
  • 1 POST
a/c switch 1,2,3 do not work only 4 is working
Oct 1, 2011 at 12:24 AM
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JACOBANDNICKOLAS
  • CAR REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi,

In most cases, the blower motor resistor has failed if the fan only runs on high. The resistor is located on the passenger side of the plenum assembly behind the glove compartment.

I attached two pics below. The first shows a general location of the resister. Pic 2 shows what the resistor looks like.

All you need to do is remove the connector and then the two screws which hold it on the plenum. Pull it straight out. The installation is the reverse of removal.

I hope this helps. Let me know if you have other questions.

Take care,

Joe

See pics below.

Apr 19, 2021 at 3:18 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.