Ac/heater fan not working

2009 NISSAN ROGUE
100,000 MILES • 4 CYL • 4WD • AUTOMATIC
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DERRICK PLUNKETT
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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
Aug 25, 2025 at 5:23 AM
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MECHTRIX
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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.
Aug 25, 2025 at 6:46 AM
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STRAILER
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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.
Aug 25, 2025 at 9:40 AM
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DERRICK PLUNKETT
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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?
Sep 1, 2025 at 10:57 AM
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STRAILER
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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.
Sep 2, 2025 at 7:32 PM