Heater Fan Wiring (long)

[wake74]

I'm trying to get my heater fan working on a daily driver / beater. I've already searched the FAQ, and read through many of the posts. However, my problem seems to be different. The car in question is a 1976 2002. This car has the yellow, violet, black, green/brown fan wiring, not the fan wiring shown on all the wiring diagrams I have.

It appears to me that the fan is supposed to work as follows:

1. Green / Brown wire is switched 12+. It attaches (the only place it can) via a male spade to the female spade on the heater housing (right middle). It has voltage.

2. Voltage should then go to fan motor, and back out one of the 3 colored connectors through resistors to give the variable speeds.

3. Voltage then goes to the dash board switch through one of the 3 colored cables and then grounds through the switch.

That is backwards from the wiring diagrams I have but appears to all be factory wiring and should work in theory.

I can not get voltage at either terminal on the fan itself even when there is voltage at the female spade on the heater housing.

The fan does work as I can get it to spin via bypassing all the wiring and just putting 12V on the fan terminal, and grounding the other fan terminal.

I'm guessing that the resistor wiring / internal heater box wiring is screwed up. I'm thinking about just bypassing the internal wiring but still using the dash switch as a 1 speed switch (high).

I have tried grounding the female spade on the box as shown on diagrams and putting voltage on the other terminals but that doesn't do anything.

Any other suggestions short of pulling the heater box?

Thanks!

Glenn

[BillWilliams]

and what I found was the spade tip connection had come loose inside the box itself.

[Guest Anonymous]

I concur with Bill W

[BillWilliams]

I feel your frustrations of having to pull the box to fix that bugger wire.

During the refurbishment of my car, I completely redid the heater box and when I installed it on the way to finishing my car, I tested the heater box and it would not work. I had to pull the box and reattach that bugger wire.

Do what you want, make it single speed or pull the box and fix it correctly. If you pull it, look a the FAQ on this site and rebuild the box completely. Thirty more years of good heat at three speeds.

[wake74]

Just to close the loop on this. Since I don't want to pull the assembly at this time for a daily driver, I ended up just wiring it as a single speed fan using the dash switch (one position only). I don't think it had been run in a real long time, as it took some spray lubricant and a screwdriver to get it to spin the first time.

Thanks for the help.

Glenn