AC/heater fan not working

Tiny
DERRICK PLUNKETT
  • MEMBER
  • 2009 NISSAN ROGUE
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 100,000 MILES
I’ve replaced the blower fan motor and the temperature control unit on the center dash. All the fuses are good and the compressor kicks on when I turn on the ac but fan won’t. No heat no defroster and no ac. Would it be a relay under the hood or in the cab fuse boxes? I’m starting to go a bit crazy and I’m very mechanically capable of doing the work! I just need a little help on if it’s a relay or what! Thanks
Monday, August 25th, 2025 AT 5:23 AM

4 Replies

Tiny
MECHTRIX
  • MECHANIC
  • 382 POSTS
Yep these things can seem simple at first but really turn into a headache. That said" first let's talk about how it happened

1. Was it working great then All the sudden just stoped working one day and never worked again?

2. Or did it Have little signes befor that? Somthing was not right or finiky?
Was it an intermittent thing for a while whould just come and go then finally quit?

3. Can you give me a short list if the things you havent checked yet?

I completly understand your frustration we've all been there.
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Monday, August 25th, 2025 AT 6:46 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,601 POSTS
It sound like you may have a fan control amplifier that is out, I would turn the system on full fan and check the yellow wire for power at the blower motor. If not check the fuses and relay I have marked in the diagrams below.

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

If so I would swap out the amplifier, here is the location and wiring daigrams so you can see what I am talking about. Check out the images (below). Let us know how it goes.
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Monday, August 25th, 2025 AT 9:40 AM
Tiny
DERRICK PLUNKETT
  • MEMBER
  • 2 POSTS
Honestly it just stopped working one day. I’ve swapped out a relay today and that still didn’t do anything for the blower. I’ve already replaced the entire control panel on the dash as well. Everything seems to be getting power so this is killing me! It’s been all summer. Thank god I gave my wife my car or she would’ve strangled me for not fixing it in May/June.

Any other thoughts?
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Monday, September 1st, 2025 AT 10:57 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,601 POSTS
Turn the system on and check for power at the yellow wire at the blower motor please, this will tell us if the amplifier is bad. This guide can help

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

Please go over this guide and get back to us.
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Tuesday, September 2nd, 2025 AT 7:32 PM

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