A/C only works on setting 1

2001 MAZDA PROTEGE
200,000 MILES • 1.6L • 4 CYL • AUTOMATIC
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JROSARIO08
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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?
Sep 8, 2018 at 5:24 PM
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STRAILER
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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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Sep 10, 2018 at 11:53 AM