Actually posting this question for my dad. Without any sort of warning, the fan in his RDX is not blowing. No air conditioning, no heat. The panel is working fine, but there is nothing being blown out the vents irregardless of what speed it is set at. Has anybody else ran into this, and if so what was the problem? Blower Motor? Transistor? All we really knew what to check whether the fuses and they seem to be fine.

Any help would be appreciated, thank you very much.

 

Sometimes fuses can be blown and visually look okay. I'd swap them just to be safe. Otherwise, I'd take out your cabin air filter and get a visual on the motor, and ensure it's not spinning/make sure something isn't wedged in there. Can't remember the RDX setup of the top of my head, but I'd try wiggling the connectors while the hvac is set to on.

 

Also, did you further check the 40amp fuse in the engine bay for the blower motor?

 

Yes, we checked that. Was one of the first things we checked.
Thanks for the info.

 

I'd be checking the blower motor itself + the resistor. After 10 years something is bound to give out.

 

If it's the resistor (which controls speed), the fan should work at high speed. You’ve checked the fuses although personally I like to check them with a DVM or by substitution. Check the motor to see that it rotates freely, then check the wiring harness, then the relay.

 

Nothing works at any speed. We tried a new blower motor but same problem, when the ignition is turned on it moves a fraction of an inch like its getting power then stops. Used a tester and there is power coming from the plug at all speeds.
Any thoughts?

 

Based on your description, it seems like the blower/fan wheel may have some resistance, e.g. from contacting the housing. Does the blower spins freely without power?

 

Especially in light of a new blower motor not working, check the relay (if it has one). I'll have to check on line but the relay box, often there are two should have a diagram..

It should resemble what is shown at Relay - Acura (39794-SDA-A03).

 

Yes, spins freely

 

If you happen to find anything let me know. I can't find any info on it myself.

 

AutoZone shows this as the blower relay.

 

First of all I appreciate all the help, can't thank you enough.

Here is where things stand, a new blower motor did not fix the problem, the old motor still spins extremely well so it's not seized or blocked or anything like that. We tried replacing the relay which also had no effect.
Fuses all checked out fine, as did the connector to the blower motor. Could it still be the resistor, seeing the blower is not working at any speed? I can't even find where the resistor is located to possibly change it.

Any other possible suggestions, or advice on locating and/or replacing the resistor?

 

Just letting you know that the problem has been solved. It was the resistor. Not the easiest thing in the word to get at, but removing the glove box helped.

Anyways, thanks to all who offered advice and opinions. All the best!!

 

Aye good looks on figuring it out and replacing it yourself!

 

Good job, Beerman 831. Did you replace the part or did you clean it? I had seen videos showing corrosion that affected the part.