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A/C blower not working properly

Tiny
MICHAEL KELLY2
  • MEMBER
  • 2004 HYUNDAI SANTA FE
  • 3.5L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
Mode actuator seems to be weak, so I go to check it. As I began feeling the actuator during mode changes (vent, floor, defrost, etc.) Blower quits. Recently replaced. Changed resistor, tried new motor, checked voltage. 5.6v at max fan, without motor connected. Connect fan, 0v. Disconnect fan, 0v. Stop and restart A/C system, 5.6v without motor. Same procedure w motor, 0v. Am I missing something? Motor works fine when connected to 12v battery (brief check, 1 second). Can I fix it or is it time to crawl to the dealer?
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Wednesday, March 3rd, 2021 AT 5:14 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Yes, the blower relay sounds like it is bad. To be sure this guide will help us test it with the relay location in the diagrams below:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
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Friday, March 5th, 2021 AT 8:12 PM

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