Heater fan speed control

[Rex Kapriellian]

I was struggling with not being able to turn the heater fan on, runs at the fan with 12V and a good ground Jumpered directly from the battery. Since I’m upgrading the AC system, and I just pulled the evaporator to replace the expansion valve, seems like a good time to go down the rabbit hole. After some trouble shooting, it came down to the potentiometer style fan speed slide, this was confirmed by jumping it to ground, and the fan come on 100%.

the points mounted at the end of the wiper wasn’t flat on the sliding surface and specially across the coiled wires, the pivot point for the wiper is also showing corrosion built up which is not helping with a good ground And adding to the problem of grounding.

So here’s my questions

Anyone dealt with this?
where can I buy the pivot pin snap in retainer, looks like a one and done deal when removing the retaining washer.

Pictures to follow

 

[eriknetherlands]

Good question.
I've never seen that part sold seperatly.

I had a broken base of the coiled wire, the ceramic part of the variables speed resistor and looked for a replacement but couldn't find it.
I was only able to locate a used full system to scavenge a part from. You might need to do the same.

 

[Rex Kapriellian]

Good question.
I've never seen that part sold seperatly.

I had a broken base of the coiled wire, the ceramic part of the variables speed resistor and looked for a replacement but couldn't find it.
I was only able to locate a used full system to scavenge a part from. You might need to do the same.

I think you’re right about sacrificing a unit.

 

[Rex Kapriellian]

This is the retaining clip that I’m after, I am afraid of mcgivering it, and then it would loose the tension. I’m sure someone here knows exactly where to pick one up . Just never purchased one.

also, that’s one of the point where corrosion/rust has built up from the current and rubbing of the metal.

I need to remove it and clean up the base and wiper.

when I shorted the fan ground directly to a good ground (by passing the resistor) I was impressed how much air it moved, so if your fan isn’t pump moving a lot of air, this is one of the week points.

 

[Rex Kapriellian]

Here’s the retaining clip

 

[Rex Kapriellian]

Wiper/slide points, first part of the action is mechanical to move the butterfly valve, 2nd part rides over the resistor, and at the end of the throw, has full contact with the ground post and full fan speed.

 

[teahead]

We're talking about the heater fan, not the AC blower fan, right?

 

[Rex Kapriellian]

We're talking about the heater fan, not the AC blower fan, right?

That’s right

 

[eriknetherlands]

The retaining clips are std industry parts here in Europe. Google 'star lock washer'.

 

[Rex Kapriellian]

The retaining clips are std industry parts here in Europe. Google 'star lock washer'.

Thanks

 

[Rex Kapriellian]

Here’s a set in Amazon