Quote Originally Posted by 85Ram50 View Post
Just a note form harsh experience, do not remove the ballast resistor?? I can't think of the name of the part that is a spring with ceramics on it. They seem to stop working just by removing them. It is where the wire plugs in on top right You have no fan if it breaks. It happened to me twice and I was lucky enough to find another heater to scavenge. The only way to get another one is from another heater. At least that is how it went on my 1st gen. BTW that alum rad I got is the same one RA shows for your truck.
There are replacement blower motor resistors that can be adapted into the OEM heater case. Just have to look and compare them to the shape and design of the old one - it may require swapping the harness connector to plug into the new unit. Have to be observant though as some new blower resistors are made for variable control or 4 fan speeds.