Heater resistor

[tbm3fan]

Is there a replacement out there for the heater resistor on a standard heater/AC car. Wanted to get my system working even though there is rarely use for it, but as of now nothing happens when you turn the system on via the controls.

 

[rexus31]

Is there a replacement out there for the heater resistor on a standard heater/AC car. Wanted to get my system working even though there is rarely use for it, but as of now nothing happens when you turn the system on via the controls.

I believe there are several on eBay. Which car is this for?

 

[Big_John]

Worse case... You can jumper the connections, bypassing the resistor. Your blower will still turn off and on, but will run at full speed.

 

[tbm3fan]

I believe there are several on eBay. Which car is this for?

The 73 Polara. I've seen the ones on eBay but most all mentioned it was for the auto temp system which I don't have.

 

[rexus31]

The 73 Polara. I've seen the ones on eBay but most all mentioned it was for the auto temp system which I don't have.

Do you have the part number?

 

[70bigblockdodge]

Even if the resistor is shot fan should still blow on high, sounds like you have no power or switch or motor not working. My Challenger had same problem, switch was bad.

 

[1978 NYB]

The resistor automatically defaults to high speed no matter what position the fan speed switch is on. If you pull the resistor out it will have a part number on it.

I know I bring up partsvoice a lot........but I find NOS stuff that I need all the damn time on that site.

http://www.partsvoice.com/

 

[MrMoparCHP]

Is this just a resistor? cold you just soldier some resistors in place of the coils? or does this behave differently? as it is inside the box?

Alan

 

[commando1]

I was led to believe it needs to be a coil rheostat type of resister because the step down in voltage produces so much heat it would burn out SS resistors.

Posted via Topify on Android

 

[tbm3fan]

The resistor automatically defaults to high speed no matter what position the fan speed switch is on. If you pull the resistor out it will have a part number on it.

I know I bring up partsvoice a lot........but I find NOS stuff that I need all the damn time on that site.

http://www.partsvoice.com/

Once looked up what I thought was the part number for a non-ATC resistor and turned up zero. Have been using partsvoice since 2008 for Ford parts. Now if it is part # 2936103 then Dawson has 4 of them as of tonight.

Given what bigblockdodge says, and since I get nothing, then maybe it is the switch or the motor and I need to figure out one from the other. I know aftermarket blowers and switch are available. Also a few NOS motors are around but don't know about switches since I'm not sure of the number. Think it is #3431497 of which some are around.

 

[Big_John]

I was led to believe it needs to be a coil rheostat type of resister because the step down in voltage produces so much heat it would burn out SS resistors.

Posted via Topify on Android

Not really a rheostat as that's an adjustable resistor. A good example of a rheostat is in the switch that dims your dash lights.

You're right about the heat from current flow through the resistor. They made them from nichrome wire and are in the airflow of the heater box to help dissipate the heat. I'll bet a blower motor draws up to 10 amps, so with a little math, we're at 120 watts.

So... yes... you are correct that you can't just solder any resistor in there and expect it to work. The 1/2 watt resistor that you could pick up at Radio Shack won't cut it.

 

[commando1]

What's that formula again?
E=IR?

 

[Big_John]

Yep, Ohm's Law

Bad boys rape our young girls but Violet gives willingly

Black, Brown, Red, Orange, Yellow, Green, Blue, Violet, Gray, White......

 

[Big_John]

I actually used Watt's law though.

P=VI

 

[commando1]

Yes. That's the one.....