I need some help with my blower control. The blower works when i jump 12v to but it doesn't work through normal operation. I checked the fuse and i have power through the fuse. I checked the relay and I'm not getting power to the coil. Checking my Haynes manual schematic...i see that the power comes through the fuse block, function control switch, to the blower switch and then to the relay. I took the dash, semi, out and looked at the blower switch. It appears bad (it looks like it got hot). My questions are 1) why didn't the fuse blow before the stwitch and connector burn up. 2) a wire going to a 2 into 1 plug the connects to the function control is burned up also. I looked for the the color code and I can't find what it is, it's black with a pink stripe. I know that the single side of the plug that it connects to goes to the function control switch. Anybody know what the goes to? I have to replace this wire but i dont know where the other end goes. Thanks for the help...

I went to look for my wiring diagram, must be in my basement. Looked at the diagram on the site here but it is not that good. The relay is just for High speed. Seems like the rest runs through the resistor pack. Make double sure the blower motor is grounded properly as this is the most common failure. Check the relay coil again when you select high speed. I will look for my diagram again tomorrow and get back.

CHECK THE RESISTOR PANEL IN THE DUCT AND SEE IF THE WIRES ARE BROKEN OR BURNT OUT! THE JUICE FROM THE BLOWER SWITCH GOES OUT TO THE RESISTOR AND THENCE TO THE BLOWER MOTOR. 70'S HAVE BAD HABIT OF BURNING UP EITHER THE SWITCH OR THE RESISTOR WHEN RUNING FULL AC BLOWER OR HEAVY HEAT, IF THE BLOWER SWITCH LOOKS COOKED, PROBABLY IS, CHEAP AND EASY TO REPLCE, GOOD LUCK:nanawrench:

the switch isnt burned looking from a short, its when its used mostly at the second to highest setting the power goes through the switch and not a relay. the resistor pack feeds power to all else. and it gets hot when on for long periods of time. also clean and wirebrush all your connections. it draws more amperage to power the motor through bad and semi solid electrical connections.

Thanks for the feedback. The switch is bad, and i'm gonna order a new one. I'm still looking for where the wire, that got cooked, goes. It's black with a pink stripe. It goes into the function control switch, from a two into one connector. the other wire that is mated to it is the brown power wire the feeds the function control. I need to replace this wire but i don't know where the other end goes, and the haynes manual doesn't show this wire nor the color code. Thanks again.

CHECK THE RESISTOR PANEL IN THE DUCT AND SEE IF THE WIRES ARE BROKEN OR BURNT OUT! THE JUICE FROM THE BLOWER SWITCH GOES OUT TO THE RESISTOR AND THENCE TO THE BLOWER MOTOR. 70'S HAVE BAD HABIT OF BURNING UP EITHER THE SWITCH OR THE RESISTOR WHEN RUNING FULL AC BLOWER OR HEAVY HEAT, IF THE BLOWER SWITCH LOOKS COOKED, PROBABLY IS, CHEAP AND EASY TO REPLCE, GOOD LUCK:nanawrench:
X2 here,ck that resistor bet its burn out..:dontknow:

Ok...inside the duct? Where exactly? I don't know where it is.

it should be on the blower housing somewhere around the blower motor its usually black and held on with two screws and has a plug going into ususally with 3 or 4 wires going into it hope this helps woody out:beer:

The relay that runs the blower on high only, is called the "high blower switch" by some parts stores, and called the" blower cut-out relay" by Advanced Auto for one. I have to assume that "cut-out" means that it by-passes the resistor in the lower speed settings.
I just bought one.

There were two systems available for your model, the GM system and the Four Seasons system. I think what you described is the GM. Neither had a black/pink wire, but the GM system had black/red, which is probably what you are looking at.

The reason it burned is due to old wiring, an old blower motor and weak connections, (high resistance, high amperage draw=heat). And possibly some time in the past it was blowing fuses and someone replaced with a higher rated fuse, who knows for sure.

I would imagine your black/red wire due to heat turned black/pink!

That being said, the black/red or pink, for that matter, plugs in to the brown wire from the fuse panel, then to the blower switch and on the function switch.

Thanks, Robert. I was hoping you could help out here, no doubt you would know. Happy birthday as well.

That being said, the black/red or pink, for that matter, plugs in to the brown wire from the fuse panel, then to the blower switch and on the function switch.

Thanks for the updates (and to everyone trying to help). Are you telling me that it plugs into the function switch to the blower switch? I didn't see it plugged into the blower switch. I did see where it plugged into the brown wire, and then to the function switch. I assumed it went to the resistor, I was gonna check that next.

Thanks again,

from the brown (power) in to the blower switch and to the function switch. It probably burned out of the blower switch.

The black w/red striped wire doesn't go into the blower switch.

It probably burned out of the blower switch.



It did burn up the switch, but what i still don't know is where the black wire goes...as i wrote earlier, I was assuming that it went to the resistor. I'm an electrician in a factory, i see electrical prints all the time...and sometimes have to "cypher" them...kinda like with this. Does anyone have an accurate set of electrical drawings? I've look on here and found the four seasons, but haven't seen the ones for my car. Any more help is appreciated!!!

Ok...I found the resistors and found that none the resistors were broken/brunt up. The relay is a puzzle to me because in the Haynes manual and the four season drawings both have five wires coming off of it...but on my car there are only four...I'm confused!!!

If it doesn't go to the blower switch then where is the power to the blower switch coming from? I still say it goes to the blower switch, worked on far too many of them. Switched 12 volts brown wire from fuse box to black/red to blower switch and on to the function switch.

(1)The orange wire with the inline fuse holder, go's to battery positive, possibly the horn relay terminal strip.(2) The purple wire is the "hot" feed to the blower motor and the resistor pack.(3) The dark blue, go's to the fan switch.(4) The black wire is ground for both the relay coil and the blower motor.

If it doesn't go to the blower switch then where is the power to the blower switch coming from? I still say it goes to the blower switch, worked on far too many of them. Switched 12 volts brown wire from fuse box to black/red to blower switch and on to the function switch.


the power to the switch is from a brown wire, it got warm also...and that is where the switch burned up. So...does that mean that the black/red is coming from the fuse box?

(1)The orange wire with the inline fuse holder, go's to battery positive, possibly the horn relay terminal strip.(2) The purple wire is the "hot" feed to the blower motor and the resistor pack.(3) The dark blue, go's to the fan switch.(4) The black wire is ground for both the relay coil and the blower motor.



Thanks bro., been having some trouble running this down. Do you have a schematic (accurate)? If you read all of the post, you will know that my problem is, when i took the blower switch out, i found a burnt wire (black w/red stripe) that connects with a brown wire (2 into 1) that connects to the function switch...I don't know where the other end of the wire goes to. Do you?

The other end of the brown wire goes to the fuse box.

The other end of the brown wire goes to the fuse box.



We're not looking at the brown wire.

The black/red is connected to the brown which goes to the fuse box.

This is the best I can do without a scanner.

The black/red is connected to the brown which goes to the fuse box.

This is the best I can do without a scanner.



Ok..the black/red go to the control switch. I didn't see where it went to because the wire actually goes back into the harness, and of course, disappears. That is the best drawing I've seen yet...where did you get it from? Now maybe I can get some heat in there!! Thanks bro for staying with me!!

That is the best drawing I've seen yet...where did you get it from?

From a very worn and tattered A/C manual I have had forever.

From a very worn and tattered A/C manual I have had forever.



oh...ok.
I was looking at the drawing and it appears to show the black/red going to the blower switch, but it doesn't. I took several pics of the switch and there is no black wire going to the blower switch. i'll have to take another look at the control switch to make sure that goes there and splice it in. Thanks again!!