Baffled by no heat!!
#1
Baffled by no heat!!
Hey all,
I have a 97 F150 4X4 4.6l V8...I have no heat at all...blows ice cold air...
So far, I checked flow through heater core, and no restrictions, blend door operates fine...changed out the thermostat, and still no heat. Once I took the cap off the pressure reservoir and put on a pressure pump to get rid of air bubbles, I got heat...110 degrees worth. But when I removed the pressure pump, the heat went away. I even disconnected the a/c compressor just to ensure it wasn't overriding the heater....ice cold air!!?? I'm baffled...I don't mind the cold, cause I'm a fat boy...but I can't defrost my windows to see where I am going. Any ideas, please throw them at me...I appreciate your help!! Thank you very much!!
I have a 97 F150 4X4 4.6l V8...I have no heat at all...blows ice cold air...
So far, I checked flow through heater core, and no restrictions, blend door operates fine...changed out the thermostat, and still no heat. Once I took the cap off the pressure reservoir and put on a pressure pump to get rid of air bubbles, I got heat...110 degrees worth. But when I removed the pressure pump, the heat went away. I even disconnected the a/c compressor just to ensure it wasn't overriding the heater....ice cold air!!?? I'm baffled...I don't mind the cold, cause I'm a fat boy...but I can't defrost my windows to see where I am going. Any ideas, please throw them at me...I appreciate your help!! Thank you very much!!
#5
Take the finish cover off the floor vent in the center, drill a 3 inch hole with a hole saw, you watch your blender door move or not, usually the pivot breaks off the door, quick fix, run a screw into the hindge either for the heat or cold depending on which way you move the door, kinda rough solution but works, tape the hole with good aluminum duct tape, replace finish cover
#6
Sounds much easier than removing the dash!! I have one question...can I get to the recirculator door behind the glove box? If I shut that, would that keep the cold air from coming in as well?? Or should I just cut the 3" hole in the plenum by the blend door, and go that route instead? Thank you guys very much for your help, I truly appreciate it!!
#7
OK...completely baffled now!!! I cut a hole above the actuator for the blend door, held a flashlight by the whole, and turned the temperature ****...and the door works fine!! So now what?? As long as the truck sits still, I have heat...as soon as I start driving...cold air...I'm at a loss!!
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#8
Sounds like you have a big vacuum leak to me. Spray some carb cleaner around the vacuum lines while the engine is idling and listen to see if the engine rpms go up. Usually that is only when you are on the skinny pedal, but if you had a big one that would add up. The resevoir is behind the battery box, toward the fender.
#9
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#11
OK, well that blows that theory out of the water...My blend door works nicely...I even pushed on it once it moved to the heat position, just to make sure it wasn't flopping, and it was good and tight...
This sucks...I don't know what it could be...it's baffling the crap out of me...I appreciate everyones help...like I said, I'll try anything...I just wanna see where I'm going on cold mornings...
This sucks...I don't know what it could be...it's baffling the crap out of me...I appreciate everyones help...like I said, I'll try anything...I just wanna see where I'm going on cold mornings...
#12
#14
I unplugged my AC compressor last weekend, and it's been unplugged ever since, just so I know it would be that...I don't know if the fan clutch is bad or not? But I do know that when I pull in my driveway and it's blowing cold air, I jumped out quick to feel my heater hoses, and they are very hot...both of them...
Who knows...I might just say screw it, and buy one of them ceramic heaters...LOL
Who knows...I might just say screw it, and buy one of them ceramic heaters...LOL
#15
Any chance you could get someone to take over driving it once its well warmed-up, while you check that blend door position while cruising along?
Oh yeah, remember to wear your seat belt, too