2001 f150 heater hose schematic - F-150 Ford Cars & Trucks

You have a Heater Valve inline with one of your heater hoses. It has a single vacuum hose going to it. Check your vacuum source first, also pull a vacuum on the valve itself to see if it holds a vacuum. If the valve doesn't hold vacuum-replace it. If you aren't getting vacuum to the valve, then something is wrong with your climate control(heater setting/ac) or the plastic vacuum line is cracked somewhere between your knobs, through the firewall, to the valve itself.

Either your heater blend door is failing, your core is plugged, or you have poor coolant circulation. checking the temp of both heater hoses will rule out the core usually. (Warm engine, heater ON, both hoses should be HOT and near same temperature). If 1 hose is hot and the other cold, your core may be plugged. If both hoses are HOT, and still no heat inside, your heater box is likely not directing the warm air properly on the interior. If neither hose is hot or warm, and heater is ON, your heater control valve should be checked to make sure it is flowing coolant to the heater.

If all THAT seems to pass (heater valve definitely open) an d still low or not heat inside and both hoses the same, your water pump may not be making enough flow to feed the engine and the heater. Typically if this is the problem, holding the engineat high rev (3000+) for 5-10 minutes will cause the heater to warm up mostly, and then dropping the RPM to 1000 or 1500 you will feel it cool off rapidly. If that is the case, you will need cooling system repairs.

Could be this. SAVE 20 GET 10 GIFT CARD ON ONLINE SHIP TO HOME ORDERS OVER 100

With a wrench.

If you mean a valve in one of the heater hoses, it cuts hot water off from flowing thru the heater core. Its controlled by the temp switch on the dash.

possible blend door in the dash is broke . when you turn blower on high it blows the door shut . i have the same issues and i have heard this could be the issue . especially since you said that you replaced everything except the blend door.

First off, is this water or antifreeze? If it's water it could be coming from the heat/air conditioning. If it's antifreeze, it's probably either a heater hose or the back of the intake manifold.

OK, Remove your t-stat, disconnect radiator hoses, drain radiator, and flush the heater core. now climb under the truck and you should find two (one on each side) coolant plugs. just unscrew them and let it drain out (into a pan I hope) good luck, really simple to do

I have read a few complaints about the plastic intake manifolds leaking. There may also be a heater hose on the rear of the engine leaking. You may be able to tighten the bolts starting from the middle and across then equally front and back. I do not have torque specs. but you may not have a torque wrench. You may get away with just tightening the bolts and not having to disassemble anything.

change the heater core