So i have this weird issue. During the summer it worked just fine. But now that it is starting to get cold. This is what happens. When cold or warming up it will not blow at all. then later when its warm it will kick on and start blowing. Sometimes it does not start blowing even.

 

So the fan only works intermittantly? If that's the problem, replace the fan ballast resistor. It should be located in the ductwork around the passenger's footwell somewhere.

 

its the blower motor resistor looks similar to this got wires attched also check the switch on dash known to melt the plug

 

Yea the blower only works sometimes, you can tell the heat works becasue when im moving i can feel heat around the vent, but the blower only works sometimes. so that picture is of something located in the passenger floor area?

 

id check the switch on the dash first mine had burned the plg where it connects to the swithch on the dash

 

check the plug on the blower motor also

 

For future reference where is the blower motor? also my dumb @## didnt check the fuse first, it was melted all to hell. anyway works fine now.

 

should be on firewall in front off pass side

 

give your self some credit you fixed it

 

So after testing it seems the heater fuse will blow if i dont let the truck warm up. if its cold it blowes the fuse. any ideas?

 

maybe the blower motor is going bad the heat from the motor warming up warming the blower motor up so it will spin?

 

that would blow the fuse? it not spinning when cold?

 

Over time the blower motors start drawing excessive power and popping fuses is the first sign imo. I'd replace the blower motor if replacing the blower motor resistor does not resolve the issue.

 

This thread:

https://www.cherokeeforum.com/f2/blo...ng-fues-38370/

has some more info, as well as what I just found out.