sam29078

I have 2002 f150 5.4l no heat I have replaced blend door, thermostat twice, intake gasket, and water pump.
Temp gauge comes up scanner reads 205-195 engine temps. The heater hoses and the upper radiator horse are not hot to the touch. If I drive like I stole it or drop a gear heater will put out enough to get warm inside. Sitting parked at 2500 rpms it will heat up to the point I would be happy with. At this point I think a fire in the cab might be the best idea.

techrep

iTrader: (1)

Are the heater hose’s going through the fire wall hot after engine reaches operating temp ??

Ford Fan#1

the thicker hose by the throttle body or by the oil cap on the left in the picture ( right side of the truck ) if you didn't know what hose he was talking about sorry about posting it twice. I couldn't get an app to circle the line

sam29078

No both heater hose are not hot. they do not reach engine temp.

techrep

iTrader: (1)

is one hot and not the other ??

sam29078

One hose is a little hotter but not much. Today on high I had 110 temp out of vent scanner reads 200 engine temp heater hoes and radiator hose are not hot.

techrep

iTrader: (1)

Sounds like a thermostat issue...I would remove it and run without and see what that does..

sam29078

I have done 2 thermostat not one helped.

djfllmn

iTrader: (1)

i see nothing about flushing the system and back flushing the heater core...usually when one hose is warmer than the other flow is restricted through the core or you have an air pocket

techrep

iTrader: (1)

I agree with you 100%... can't get a warm and fuzzy answer about the heater hose's...lol One is a little warmer than the other...main radiator hose not hot ??