jimmieblueey
Member
My 71 dart with factory a/c has no power to the blower motor.Fuses are all ok.Does the power run from the fuse to the switch and then to the resistor?? What area should I be checking for power??
No power to the blower motor
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Pawned
N.R.A. Lifetime Member - And damn proud of it
I can post the schematics if you wish
nm9stheham
Well-Known Member
Make sure you have a heat or coll function selected; the blower will not run if OFF is selected.
If you open up the heat control, you ought to see a tan switch that the buttons go into. This not only manages the vacuum controls to direct air but also engages a built in switch that connects the fused blower power to the blower switch. This often gets tarnished and corroded and will get hot and melt around the contacts and that will break the contact of power to the blower switch.
There is a sticky thread at the top of this subforum that describes a repair of this switch.
If you open up the heat control, you ought to see a tan switch that the buttons go into. This not only manages the vacuum controls to direct air but also engages a built in switch that connects the fused blower power to the blower switch. This often gets tarnished and corroded and will get hot and melt around the contacts and that will break the contact of power to the blower switch.
There is a sticky thread at the top of this subforum that describes a repair of this switch.
Pawned
N.R.A. Lifetime Member - And damn proud of it
Yes i am sure I have that those already scanned into the puter. I can post it here, or send me your email and I will send it to you
Pawned
N.R.A. Lifetime Member - And damn proud of it
Hope these are what you are looking for. I did not include the drawing of how I fixed my problem. Better you should figure out your own for your car.
BTW. visually check the a/c and heater blower motor resistor. It sits on top of the air plenum and is behind the glove boxView attachment AC heat wiring 1.jpg
View attachment 2013-09-28 14.19.23.jpg
BTW. visually check the a/c and heater blower motor resistor. It sits on top of the air plenum and is behind the glove boxView attachment AC heat wiring 1.jpg
View attachment 2013-09-28 14.19.23.jpg
Pawned
N.R.A. Lifetime Member - And damn proud of it
You're welcome
BillGrissom
Well-Known Member
Often what happens is that the high current from selecting "blower high" position melts both the speed selector and the push-button switch. When I fixed mine (in 2 cars), I put a relay for the "high" position so it doesn't fry the restored switches.
Dfr360cuda
Diagnosis... Plum Crazy.
This is common on Dakotas and Durangos.
High current burns resistor open and melts connector.
I've changed mine twice.
Several coworkers also had this problem.
I would check the common on the resistor with a voltmeter.
Should have 12 volts with blower switch "ON"
If you can get resistor out, check continuity.
Should get readings from common to each of the other terminals
No continuity = open circuit
:burnout:
High current burns resistor open and melts connector.
I've changed mine twice.
Several coworkers also had this problem.
I would check the common on the resistor with a voltmeter.
Should have 12 volts with blower switch "ON"
If you can get resistor out, check continuity.
Should get readings from common to each of the other terminals
No continuity = open circuit
:burnout:
Pawned
N.R.A. Lifetime Member - And damn proud of it
I don't know about you, but when you go out of your way to be nice and help someone, Scan/post schematics per se, it would be nice to get a thank you for your efforts, or at the very least an acknowledgement the schematics were received.
I guess I am too picky
Ed
I guess I am too picky
Ed
What is the best way to access the resistor to test? I was thinking remove glove box?
I have a `67 Dart and `71 Demon to test out, both a/c cars.
I have a `67 Dart and `71 Demon to test out, both a/c cars.
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