Classic Mustangs (Tech) Technical discussions about the Mustangs of yester-year.

What is a rheostat?

Old 02-10-2019, 02:52 PM
Thread Starter
Join Date: Feb 2016
Location: Mississippi
Posts: 14
Default What is a rheostat?

I have a 65 mustang and I decided I would redo the heating system. The car hasnít had operating heat since I got it years ago. I took the heater box out and there is no heat resister in the front of it and thereís no hole where there ever was one and I donít see any wires for it either. I also noticed that the heater control in the dash looks different than the ones I see pictured in the parts magazines.

I then saw a heater jumped wire that looks more like what plugs into my heater control switch and I am wondering is this what I need or do all 65 Mustangs have the resistor? Do I need to cut a hold and put the resistor in?
creel228 is offline  
Old 02-10-2019, 03:50 PM
Join Date: Jan 2018
Location: Pennsylvania
Posts: 2,326

It's basically an adjustable resister...

It can can adjust generator characteristics, dim lights, and start or control the speed of an
electric motor. A potentiometer is basically the same thing, but I generally characterize a
rheostat as more heavy duty, but the term "rheostat" is becoming obsolete, and being
replaced by potentiometer.

You can replace a HVAC fan controller with one, which gives you complete adjustment.
The resisters in HVAC car systems are staged levels using fixed resisters for set speeds.
Using a rheostat will just allows you whatever speed you want. The dash light dimmer
you turn on the headlamp switch is a rheostat (potentiometer). If you had a resister
pack like in a HVAC fan controller for dash lights, then you'd only have three - four
fixed settings for the dash lights...

Last edited by 08'MustangDude; 02-10-2019 at 03:56 PM.
08'MustangDude is offline  
Related Topics
Thread Starter
Last Post
bronco slim
Want To Buy Ads
04-06-2007 11:43 PM
4.6L (1996-2004 Modular) Mustang
07-21-2006 08:26 AM
Audio/Visual Electronics
04-12-2006 02:32 PM

Thread Tools
Search this Thread
Quick Reply: What is a rheostat?

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.