ResearchFreak

i just replaced the blower motor resistor in my wife's 2005 Acura TL w/nav (super easy) and now she says the fan blows at a higher rate than before. It's adjustable just like it's supposed to be but even the low setting blows a lot of air. Doesn't matter what the temp or any other setting is.
My first thought was that she got used to it being bad and now it's working correctly but it does blow pretty hard on low. My second thought is that the resistor is not as resistant as the OEM part would be. It was an after market resistor from O'Reilly auto.

Anyone know what the system CFM or fan speed is supposed to be?
Anyone see or hear of this before?
I'm thinking of adding a resistor at the blower motor to slow things down. Any better ideas?

Thanks, Mark

polobunny

Which resistor are we talking about? Have you changed it by one of the same resistance?? You can't just go ahead and change it by a random resistor you find at the bottom of a drawer in your workbench haha

ResearchFreak

Naw, I used one from the top of the drawer.

Actually it's all one unit with a large heat sink and a connector. I took the old one apart and if I'd known, I would have just replaced the $5 NEC K2500 resistor that's in the unit.

nfnsquared

I'm gonna bet the A/M resistor is the culprit. I'd try replacing the K2500 and see if that makes a difference. Not sure why you went with A/M though, the OEM resistor is only ~$25 IIRC.

ResearchFreak

I ended up replacing the K2500 mosfet inside the old one with a newer replacement - FDH5500. Now the blower is back to the normal speeds.
It only cost $8 to fix the old one.