My 98 XLT 4.6 EXP overhead climate control unit in the front, not the middle. The lights are out, How do you change the blubs, Also I had my heater core replace last week, the front heat blows hot but the middle and rear blows cold, but once I drive it blows luke warm in the rear and when idle it blows cold again. Did anyone every had this issue with your heat, once you had the heater core replace.

 

The rear heater lines could be air bound.

 

the rear has its own heater core.

 

Mines only have one heater core..

 

If you have rear heat, then you have another heater core back there.

 

I thought it was only on the 5.4 models.

 

Engine is irrelevant, the climate control system is the same for either.

 

I called the ford dealership, and they said for my model 98 4.6l XLT it just have 1 heater core, the 5.4l have 2.