The e-150 heat/ac system uses vacuum to control the air direction through a series of doors. There is most likely a vacuum leak causing the defrost door to keep air flowing away from the dash vents.
How do i change the heater core on a 1997 ford e150
The various functions are controlled by engine vacuum,defrost being the default without vacuum. Look far a damaged or loose vacuum line starting from the function switch,through the reservoir,to the engine vacuum port.
dah stupid by removing the screw
According to the 2003 Ford E150 owners manual : 5.7 liters ( 6 quarts - U.S. ) with oil filter change
6 qt
This is the escort forum not the E 150 forum.
Drop the fuel tank down & change the pump.
I have a 1990 e150 and it has 2.
It is usually found in , or by the iar filter.
e150 is a half ton and an e250 is a 3/4 ton
Max Towing Capacity(lbs) for model E150 is around 6400 lbs
6.0 quarts with engine oil filter change , according to the Owner Guide