Car heat/AC won't blow any air when sitting still or driving slow?

Tiny
TDOLL816
  • MEMBER
  • 2009 NISSAN ROGUE
  • 4WD
  • 220,000 MILES
If your car heat/AC won't blow any air when sitting still or driving slow, but will blow a little while driving, and it will blow cold and hot however you set it, but it's not like normal temperature, and won't blow at all if its on max A/C setting. Is this my blower motor? I was told that it's not actually blowing air while driving fast, that it's just the air flowing through the system from outside, and my defrost won't turn at all, not even with speed. I turned my car half way on just where the radio came on, but didn't start it. I opened the glove box and listened as I turned each knob, I could hear electric humming whenever I turned it from hot to cold, and I could hear like very faint popping when I change the directions from feet, or full, or head only, or feet only, every direction I changed it too, it made that noise, but when I change the speed I hear nothing at all. I was told it could be blower motor by several people, but I also heard it could be the resistor. How do I know which one it is without having to take it in? I can't afford the shop unfortunately and am trying to just buy my part and have my mechanic install it. I want to avoid buying the wrong part. Please help me.
Sunday, January 10th, 2021 AT 2:01 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

I attached a wiring diagram of the system for you to view. I would start by checking the fuses for power on both sides of the system.

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

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Beyond that, we need to do some voltage checks at the motor to see if it is the motor itself.

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

The system does not have a resistor, it has an amplifier.

BLOWER MOTOR

Removal and Installation

REMOVAL
1. Remove instrument driver lower cover. Refer to See: Dashboard / Instrument Panel > Removal and Replacement > Exploded View.
2. Remove combination meter. Refer to See: Instrument Cluster / Carrier > Removal and Replacement > Exploded View.
3. Remove knee protector. Refer to See: Dashboard / Instrument Panel > Removal and Replacement > Exploded View.
4. Remove foot duct LH. Refer to See: Air Duct > Removal and Replacement > Exploded View.
5. Remove mode door motor. Refer to See: Air Door Actuator / Motor, HVAC > Removal and Replacement > Manual Air Conditioner.
6. Remove brake pedal assembly and accelerator pedal. Refer to See: Brake Master Cylinder > Removal and Replacement > Exploded View.

7. Disconnect blower motor connector (A).
8. Press flange holding hook (1). Then turn blower motor counterclockwise (2).
9. Pull outside (3) and remove blower motor.

CAUTION:
The balance is adjusted when blower fan and blower motor are assembled, so do not replace the individual parts.

INSTALLATION
Installation is basically the reverse order of removal.

CAUTION:
Install correctly blower motor flange holding hook in A/C unit assembly.
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Sunday, January 10th, 2021 AT 5:03 AM

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