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A/C only works on setting 1

Tiny
JROSARIO08
  • MEMBER
  • 2001 MAZDA PROTEGE
  • 1.6L
  • 4 CYL
  • AUTOMATIC
  • 200,000 MILES
The A/C only works on 1, neither of the 2, 3 or 4 works, not even the fan turns on. I already changed the blower motor, the blower switch and the motor resistor. What can it be?
Saturday, September 8th, 2018 AT 5:24 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Hello,

It sounds like you lost the switch ground. Here is a guide to help you test it with the blower motor wiring diagrams so you can see how the system works:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Connect the test light to power to test the ground.

Check out the diagrams (below). Please let us know what you find.

Cheers, Ken
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Monday, September 10th, 2018 AT 11:53 AM

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