johndeere01

Helllo
I just foigured out that the blower fan dosnt work on the truck an its gettin colder up here. I took the fan out hooked it to a battery an it runs find no noise or anything, Fuse is good put a new fuse in just incase, and i have power at the fan switch in the dash i cant figure out where the wire goes from the switch to the fan, does anyone know? Had this happen? any help will be appriciated

ofcmarc

Try this.

https://www.dieseltruckresource.com/...d.php?t=158400

Good stuff in there.

johndeere01

thanks for the link but my fan works when hooked to a battery, but i dont have any power at the fan its a dark green wire anyone know where it goes
or where it comes from?

sooty

wire at blower motor, comes from the blower speed resistor pack, located on the outside of the heater/air conditioning housing, passenger compartment side, behind glove box, 4 wire connector, with 2 1/4" hex screws, green wire outputs to motor, other three, are lower speed control, check for power in with various speeds, and out to motor, hooked up, and disconnected, (load and no load)

johndeere01

thanks very much

ofcmarc

The link shows a bunch of problem areas in the power supply for the heater fan controls. ie: the fuse block and the switch. The resistor is behind the glove box and really easy to access/replace if needed.

I'd look at the back of the fuse block just to make sure.......

ppiggppenn

My connector at the motor was my recent problem, .... cleaned up the contacts and away she went. I had done like you and pulled the motor out for replacement and thought I'd test it on the battery first. Good thing I did!

NO_SPRK

I have the same problem. I had the whole dash apart tracing the problem but had to stop midway. Haven't fixed it yet.

too tall

I had the same issue . I replaced everything in the system including the ignition switch . I ended up re-powering the feed to the fuse box via a relay . I don't know what the real issue was I couldn't figure it out so I made my own solution .

JustRamIt91

Mine was an easy fix, i didn't have to remove anything. Used a circuit tracer to see what was wrong before i removed a screw more than i needed to. Turned out that the power cable had a small slice in the wire and had since corroded away to nothing, a few bumps in the road knocked it loose. Stripped it back and butt-spliced it back together. I also know that the resistors tend to burn out, if u loose a speed or two, you probably did. You can just buy them from a radio-shack and make your own set-up from the switch to the fan. Did that in my 89 Ramcharger (bad radio install) Interior light made my fan come on and had to have that running in order for radio to have power??? i just cut all wires out and started over with a new fuse box.

johndeere01

thanks guys ill check but my fan runs when hooked to a battery and i have power an the fuse and at the switch all 3 wires so im think its the resistor behind the dash anyone know where to get one? thanks again

Santaclaus

Get a hot wire and start at the blower motor while it's mounted, if the blower runs then go inside to the resistor pack and apply 12 V to each one of the resistor wires, ( do this with the ignition off and the blower turned off ) if the blower does not start when you apply 12 V on the inside than the wire from there to the outside it broken. That is usually the way I trace things, start from where you know it works and work backwards, sooner or later you'll find what's broken.
Good luck, Mike

sooty

any auto parts store should have it, try napa

JustRamIt91

Anything similar to this

Should work fine. Just attach it to a + positive circuit on the truck.
It will light up when you either complete a circuit or make a good connection to ground.

johndeere01

Alright thanks guys its been nice here the past 2 days so ive been busy splittin wood an catchin up on outdoor stuff before it snows, my next question is the wire that runs the temature hot or cold its a heavy wire almost like fence wire, its broke about 3 inches from the handle any good way to rapair rather than replace?
thanks again