1998 Lincoln Navigator Q&A
1998 Lincoln Navigator Question: No heat & or A/C coming out
You could have an engine that is not getting hot enough, or a temperature blend door motor in the dash that is not working. Check the inlet and outlet hoses for the heater core -- very hot? Both? If so, it's a blend door issue. - DaveJHM
In the winter, I have no heat from front-controled heater; rear is ok. After driving, stopping and restarting the car, heat will occur normally, front and rear. In the summer, a/c will work front ...