Ford Expedition 2002 Front Heater blows cold air below 45 MPH

If the engine is reaching normal temp, and both heater hoses are hot, you may have a problem with a blend door under the dash.

No hot air is due to low coolant, or even poor coolant flow. The engine heats up the coolant, and it passed through your heater core, and the heater blower motor pushes air through the heater core to warm up the air. If your "fan"is working, but the air is cold, make sure your coolant level is good.

two things that I have seen cause that problem is the blend door get stuck or stop working and the Heater Control Valve go bad and stop the hot coolent from going to the heater core. I hope this info helps

Have had the same problem 2000 ford expedition. got it working good now

its the blend door behind the glove box. I had the same problem

I ASSUME THIS IS A 98, THIS PROBLEM IS CAUSED BY A PART CALLED AN "AIR TEMPERATURE CONTROL BLEND DOOR ACTUATOR MOTOR" THIS MOVES A DOOR BETWEEN THE COLD AIR FROM THE AC AND THE HOT AIR FROM THE HEATER CORE, YOU WILL NEED TO REPLACE THAT ACTUATOR. .

Check the fuses for the blower motor and check power to the front switch to the blower.

Shelly,

Buy used parts at car-part.com. Look on page with * to find the cheapest part. Coud be your temp blend door (#2) may not be moving back and forth. Or, you are not getting hot water to the rear heater core.


You may have to crawl under the truck and feel the heater hoses to see if they are hot. You will find a group of 4 lines, 2 for heater and 2 for a/c. If hot, you know hot water is getting back to the heater core. If not, there may be a hot water vave that's not working. Not sure if EXP. has a water valve for rear.

Let us know what you you find. Good luck.

EITHER VALVE STUCK TO ALLOW WATER IN MATRIX OR YOU HAVE AIR BLOCK IN IT. TAKE OFF TOP HOSE AND RUN MOTOR, TOP UP RAD AT SAME TIME, USED A DESCALANT IF WATER MUDDY /RUSTY LOOKING

check the coolant level make sure it is full and there is no air in the system.