Bad motor blower


#1

esterday we had some bad weather and I decided to turn the heat in while on the way to church. It worked and then it started blowing excessively. I turned it off completely yet the air kept coming out even once I turned the car off. We proceeded to church praying it would stop however we came out and it was still going. After looking it up It said the blower motor switch was bad and needed to be replaced. A little longer into the day and the battery died. Which turned out to be a result of the blower motor still going. Had to get a jump just to get home. When I got home I decided to disconnect the battery for the night and had to call out from work since there were no mechanics open. This morning I went out and reconnected the battery and the air was still blowing. After looking up a video of how to replace the blower motor, I decided to disconnect the motor blower hoping it would be a temporary fix since I won’t be able to get this permanently fixed until Friday. My question is. Will me disconnecting the motor blower cause any other problems?


#2

No.

Tester


#3

Replacing the blower motor won’t fix the problem. The new motor will do the same thing. You didn’t tell us anything about what vehicle you have, so it’s not possible to give exact advice, but you might have a failed relay, HVAC control module, or wiring fault.


#4

No, disconnecting the blower motor temporarily will not hurt anything. It was a good idea. Might also have considered removing the fuse.


#5

Going with NYBo on a bad/stuck relay

You’ll know which one it is when you pull it out, the blower will quit running.


#6

I have seen blower control modules fail that way, the blower stays on high and won’t shut off.


#7

My apologies guys. It’s a 2004 Chevrolet Impala. The air was stuck in full blast and when I looked it up it said it could be the motor blower resistor. I only disconnected the chord connecting the resistor not the motor itself. If that makes sense.


#8

This car has a solid state blower control module replacing the old resistor block, that module can “short to power” causing the blower to remain on when it shouldn’t be. These modules are used on 2004 and newer Impalas so it is no surprise what year Impala you have.


#9

Just a couple things. You don’t have to disconnect the battery or even the blower but you can just pull the appropriate fuse when you shut the car down.

When I had that problem with my Olds, it was the blower control module. I think I paid about $35 at the junk yard. Switch? Maybe but there should have been some warning and the switch problems I’ve had fail in the off position, not on.