New guy with a problem
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New guy with a problem
Hello all,
I recently purchased a 1993 Dakota Club Cab. One issue I have is the AC fan will not turn down or off. It blows on high all the time. I pulled the dash apart, got at the control and disconnected it and it still blew. Any ideas would be greatly appreciated.
Thanks
I recently purchased a 1993 Dakota Club Cab. One issue I have is the AC fan will not turn down or off. It blows on high all the time. I pulled the dash apart, got at the control and disconnected it and it still blew. Any ideas would be greatly appreciated.
Thanks
Champion
Joined: May 2008
Posts: 4,839
Likes: 5
From: Apex, NC
Welcome to DodgeForum!
The faq section has description of this problem and a picture of the blower motor resistor pack. It's actually not behind the dash, it's on the firewall far passenger side.
**EDIT** Here, I copied it for you:
The faq section has description of this problem and a picture of the blower motor resistor pack. It's actually not behind the dash, it's on the firewall far passenger side.
**EDIT** Here, I copied it for you:
My heater blower doesn't work on all the settings- Chances are that the blower resistor block is faulty. The resistor block is located on the passenger side firewall. (See picture below for location). It's very easy to change out.
Last edited by 95_318SLT; Oct 21, 2009 at 06:46 PM.
Champion
Joined: May 2008
Posts: 4,839
Likes: 5
From: Apex, NC
I'm not 100% sure it applies either, but it's a good place to start. Before you mess with that though, try pulling the blower motor fuse. It's a 30 amp fuse in the #1 position in the box. If the blower motor still runs after the fuse is pulled, then you have something weird going on. If it doesn't run after the fuse is pulled, either you have a bad switch, or a bad resistor block.
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Well I pulled the fuse and the fan stopped, so that is normal. Next I replace the resister and the fan continues to blow on high. So, is it the control unit in the dash, or is there something else at the blower end that can be bad? I pulled the old resister and could see it was bad, so I was surprised when the new one didn't fix the issue.
Champion
Joined: May 2008
Posts: 4,839
Likes: 5
From: Apex, NC
The is the description the FSM gives for the blower motor circuit:
HIGH position.
If you know how to read them, here are the wiring diagrams to go along with that description (if you want to see them in more detail, you can download the '95 FSM from FAQ2 (rapidshare link)).
Blowermotor1.jpg?t=1256511857
Blowermotor2.jpg?t=1256511867
You can look at those and see if you agree with me or not, but I think the only thing left to be bad is the HVAC switch panel.
BLOWER MOTOR
When the ignition switch is in the RUN position,
circuit A2 from fuse E in the Power Distribution Center
(PDC) connects with circuit A22. Circuit A22 supplies
voltage to a bus bar in the fuse block that
powers fuse 1. Fuse 1 protects circuit C1 which supplies
battery voltage to the blower motor.
The ground path for the blower motor is through
circuit H6 to the blower motor resistor block and
then through the fan switch in the A/C heater controls
to circuit Z1. The blower motor resistor block
consists of four resistors connected in series. Ground
circuit Z1, which is the ground circuit, terminates at
the instrument panel lower right reinforcement.
Each resistor in the blower motor resistor block is
spliced to the fan switch on separate circuits; C4, C5,
C6, and C7. Depending on fan switch position, voltage
passes through one or more resistors to ground.
Blower motor fan speed is controlled by the number
of resistors voltage passes through to ground.
When the fan switch is in the LOW position, circuit
C4 provides the ground path. In the M1 position, circuit
C5 provides ground. In the M2 position, the
ground path is through circuit C6. Circuit C7 provides
path for ground when the switch is in the
When the ignition switch is in the RUN position,
circuit A2 from fuse E in the Power Distribution Center
(PDC) connects with circuit A22. Circuit A22 supplies
voltage to a bus bar in the fuse block that
powers fuse 1. Fuse 1 protects circuit C1 which supplies
battery voltage to the blower motor.
The ground path for the blower motor is through
circuit H6 to the blower motor resistor block and
then through the fan switch in the A/C heater controls
to circuit Z1. The blower motor resistor block
consists of four resistors connected in series. Ground
circuit Z1, which is the ground circuit, terminates at
the instrument panel lower right reinforcement.
Each resistor in the blower motor resistor block is
spliced to the fan switch on separate circuits; C4, C5,
C6, and C7. Depending on fan switch position, voltage
passes through one or more resistors to ground.
Blower motor fan speed is controlled by the number
of resistors voltage passes through to ground.
When the fan switch is in the LOW position, circuit
C4 provides the ground path. In the M1 position, circuit
C5 provides ground. In the M2 position, the
ground path is through circuit C6. Circuit C7 provides
path for ground when the switch is in the
HIGH position.
Blowermotor1.jpg?t=1256511857
Blowermotor2.jpg?t=1256511867
You can look at those and see if you agree with me or not, but I think the only thing left to be bad is the HVAC switch panel.
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Well, my problem still persist... I replaced the ac/heat controler with a used unit that the previous owner said worked. My fan still blows on high. I'm not sure what to do next. I guess I'll pull the blower and look for wiring issues on that end. Any other ideas?
