If one works, and the other doesn't... Switch the relays (right to left) Most probable cause
you will have coolant in your passenger front floorboard and when you turn your heater on your windshield will fog up
I would first check either the controls to the front heater core or a blocked front heater core. It could also be a blocked or missing heater hose to the front heater core, although that seems quite unlikley.
no heat front defrost dsah.
The dash has to be removed. Once the dash is out, the top of the heater case comes off to gain access to the core.
no, for many reasons, NO.
Probably because coolant level is low
Make sure you have enough coolant in your radiator. The radiator is the thing in the very front of the car, the very front of the under the hood area.
can you please clarify what you mean, do you mean that the front heater blows cold but the rear blows hot or do you mean that when the heating is on cold it blows hot? many thanks paul
if the rear ac is working then you probably have a damper door that is inoperative. this is in the heater/evaporator box. so if it isn't working then you will be heating and cooling at the same time out of the heater box.
What's the best way to change A DASH heater core in a 1999 ford expedition ANSWERE: Its a long process, but I found instructions at the Queegebo website site. They are very good and walk you through step by step with pictures. Here is the link. http://www.queegebo.com/articles/cars--other-vehicles/heater-core-replacement-instructions.html
replace front heater corefront and rear have independent heater cores
The 2004 Ford Expedition has 63.4 in. of front shoulder room.