Blower Motor not working
Thread Starter
Racer
Joined: Oct 2008
Posts: 475
Likes: 3
From: Windham NH
Blower Motor not working
Well i have gotten stumped on fixing the blower motor on my 71 LS5. I first checked to make sure i had voltage to the motor and found that i had power when i turned on the fan and no voltage when i turned it off. I then tried running a new ground from the motor to the starter ground. There still was voltage to the motor but didn't work. I figured the motor was no good so i bought a new one. It did the same thing (nothing). I then took a couple jumpers and used the power and ground from the alternator and it worked. So i know the motor does work.
I know i'm missing something.. Can anyone help with some ideas on where to go from here?
Thanks, Matt
I know i'm missing something.. Can anyone help with some ideas on where to go from here?
Thanks, Matt
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,851
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
I'm sorry but what you said kind of doesn't make sense. You said you have power when you turn it on and and no power when you turn it off.
I'll post you a schematic and help you, but first do you have a/c?
I'll post you a schematic and help you, but first do you have a/c?
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,851
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
There won't be any voltage when you have it in the off position... Just the second, third and high click will have voltage. In the first two, the voltage will leave the switch on either the light blue or the yellow wire and hit the resistor. It will exit the resistor on the orange wire and feed the blower. When you put it in high it by-passes the resistor and goes straight to the blower motor.
Hope this all makes sense..
Willcox
Hope this all makes sense..
Willcox
Last edited by Willcox Corvette; Jul 25, 2013 at 09:27 PM.
Thread Starter
Racer
Joined: Oct 2008
Posts: 475
Likes: 3
From: Windham NH
So in the high postion it doesn't go through the resistor. I know i have voltage in the high position to the motor so i will work from there.
I still feel there is an issue with the ground. I tried using the ground on the alternator when i was trouble shooting with no luck..
Can i use a ground from anywhere to help troubleshoot the motor?
I still feel there is an issue with the ground. I tried using the ground on the alternator when i was trouble shooting with no luck..
Can i use a ground from anywhere to help troubleshoot the motor?
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,851
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Yes.. but.. you can verify the ground real easy. Using your test light, pull the orange and black wires from the blower motor. Place the tester between both and see if it lights up... If it does you've pretty much verified ground. Make sure you have a bright light in the tester and not a dim one... If it is dim then you do have an issue.
But what you should do is start with High.. test for voltage at the motor. Then go to the second click and test and then the first. If you don't have power on the two lower speeds then I would head inside the car to the resistor and start testing.
Willcox
But what you should do is start with High.. test for voltage at the motor. Then go to the second click and test and then the first. If you don't have power on the two lower speeds then I would head inside the car to the resistor and start testing.
Willcox
Racer
Joined: Jul 2013
Posts: 385
Likes: 3
From: Leesburg VA
Is there a capacitor in the system that provides the inital burst of power to start the fan? I am no expert, but I had a heater system before that would not run the blower at all. I discovered that if I just gave the squirrel cage fan a little spin when the circuit was energized the motor would start and run perfectly. The capacitor was replaced and I have had no further issues with the fan starting on its own. I am new to the forum and Corvettes...not sure if there is a capacitor in the circuit at all. If you could get at it to give it a nudge it would be interesting to see if it would turn on its own though.
Just my $0.02
John
Just my $0.02
John
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Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,851
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Is there a capacitor in the system that provides the inital burst of power to start the fan? I am no expert, but I had a heater system before that would not run the blower at all. I discovered that if I just gave the squirrel cage fan a little spin when the circuit was energized the motor would start and run perfectly. The capacitor was replaced and I have had no further issues with the fan starting on its own. I am new to the forum and Corvettes...not sure if there is a capacitor in the circuit at all. If you could get at it to give it a nudge it would be interesting to see if it would turn on its own though.
Just my $0.02
John
Just my $0.02
John