HVAC does not work on settings 1, 2, or 3

Tiny
ACCDOG
  • MEMBER
  • 1999 HONDA ACCORD
  • 2.3L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
It only works on 4. The Temperature control works fine, and I can get warm or cool air, but I don't want the HVAC to run on full blast without option. I did notice when I change the air settings, like from the windshield to the body and feet settings, the A/C button lights up without me pushing it. I don't know if there is a relay problem or anything, yet I'd appreciate some assistance.
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Friday, April 8th, 2022 AT 6:05 AM

4 Replies

Tiny
WENDY W
  • EXPERT
Hello,

It sounds like there may be an issue with the blower resistor or the heater fan switch, preventing the blower motor from running at lower speeds. I've attached a diagnostic chart, below, that can help you test both of these components to see which one may be faulty. I've also attached photos and diagrams showing the locations of the blower resistor, heater fan switch, and blower motor relays.

Additionally, these repair guides explain how to check the wiring in a vehicle, and how to use a test light:

https://www.2carpros.com/articles/how-to-check-wiring

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

Please let us know if this helps!

Thanks, Wendy W.
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Friday, April 8th, 2022 AT 6:51 AM
Tiny
ACCDOG
  • MEMBER
Thanks. I'll do the test ASAP.
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Friday, April 8th, 2022 AT 7:11 AM
Tiny
ACCDOG
  • MEMBER
Hello Wendy. Thanks again. I did the test and found that the blower motor resistor was done. I've made arrangements to replace it. Thanks again for all your help.
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Friday, April 8th, 2022 AT 12:07 PM
Tiny
WENDY W
  • EXPERT
You're very welcome, I'm glad you were able to pinpoint what needed to be repaired.

Thanks for letting us know how things worked out!
Wendy W.
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Friday, April 8th, 2022 AT 4:08 PM

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