Hi everyone, I just purchased a pre-owned 98 xlt 2 wheel drive. I also just joined the forum so thanks for the great forum.

I bought the truck when the weather was still warm and never thought about checking the heater. Luck would have it that the cold weather is moving in and I went to turn the heater on and nothing warm about it. I wanted to pick everyones brain, did some searches but wanted to post my question.

My temperature gauges are all normal, everything running fine. I turn the heater all the way up and get nothing but cool air. I was hoping you guys could give me some opinions on what scenarios I am looking at. Starting with the slightest all the way up to the most complicated. Not sure where to start or if there could be several options to look at. I would appreciate all the help I can get. Starting to get chilly outside.

Thank You

Terry aka gate in

 

Most common failures are either the temperature control **** breaking and/or the temperature blend door breaking. Pull the control **** off the switch and see if it's split, not allowing the switch to turn. If that's okay, then the temperature blend door is probably broken. Search this forum for more info.

 

Okay, where is the temperature blend door located?

 

I pulled the control **** off and it looks fine. Not cracked and the metal nub is in the far right position where the **** was positioned.

 

Behind the dash, inside the evaporator/heater core case. You can remove the black trim cover on the transmission hump inside the cab and look carefully through the passenger's side with a penlight to see the blend door motor where it connects to the blend door. The door commonly splits at this location, and the dash has to be removed to replace it.

 

Crap, so I have to take apart the dash? Can you tell me what the thermostat looks like? I guess I'm an idiot, but not sure what I am looking for I guess.

 

I think I'm having a similar problem to Gatein. My heater sometimes blows cold air when set to heat but I've found if I slowly move the temp **** back and forth a bit I can get the heat to come on. When set the temp stays where it was set. What might that be? The damper door or the switch?

 

Sometimes the temp. control rheostat will go bad. The shaft will be loose when you wiggle the ****. It cost less than $20.00 at the dealer and is easy to replace.