HVAC
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Joined: Dec 2005
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From: N Hollywood CA
HVAC
97 F150, 4.6, blend door , actuator good, (gained access, checked actuator, door) new t-stat. Very little heat. Temp control valve(if installed)? Temp selector switch? Any Ideas are greatly appreciated.
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New User
Joined: Dec 2005
Posts: 17
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From: N Hollywood CA
Had blend door actuator off, r (replaced) was able to cycle door manually. with eng. warmed up, and actuator removed, cycled door again, still no heat. one heater hose is warmer than the other.
Cross-Country
Joined: Jul 2007
Posts: 72
Likes: 0
From: S. NH
I actually meant blend door **** (thing on dash). Did you check this yet?
It sounds like you're getting coolant into the heater core, and it's operating correctly (i.e. hot in, cooler out).
EDIT: You beat me to my post.
With regards to the ****, mine felt like it was "normal" too. I turned it with pliers then I started getting hot heat.
It sounds like you're getting coolant into the heater core, and it's operating correctly (i.e. hot in, cooler out).
EDIT: You beat me to my post.
With regards to the ****, mine felt like it was "normal" too. I turned it with pliers then I started getting hot heat.
Hotshot
Joined: Jan 2004
Posts: 19,768
Likes: 1,082
From: St Louis
Forget messing with the ****, it isn't the problem. You already proved that when you observed the operation of the blend door earlier.
The actual problem is that you do not have hot coolant properly circulating through the core. With the engine fully warmed up, both hoses should be too hot to touch for more than a very very short time as the circulating coolant should be 190F+.
Typical causes are low coolant, air bubble in the heater core loop, kinked or faulty hose, clogged heater core, or a worn out pump.
Ford didn't install a shutoff-valve from the factory in the half ton pickups, but that doesn't mean one wasn't added later. You will need to physically inspect the lines.
one heater hose is warmer than the other.
Typical causes are low coolant, air bubble in the heater core loop, kinked or faulty hose, clogged heater core, or a worn out pump.
Ford didn't install a shutoff-valve from the factory in the half ton pickups, but that doesn't mean one wasn't added later. You will need to physically inspect the lines.
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Cross-Country
Joined: Jul 2007
Posts: 72
Likes: 0
From: S. NH
Forget messing with the ****, it isn't the problem. You already proved that when you observed the operation of the blend door earlier.
The actual problem is that you do not have hot coolant properly circulating through the core. With the engine fully warmed up, both hoses should be too hot to touch for more than a very very short time as the circulating coolant should be 190F+.
Typical causes are low coolant, air bubble in the heater core loop, kinked or faulty hose, clogged heater core, or a worn out pump.
Ford didn't install a shutoff-valve from the factory in the half ton pickups, but that doesn't mean one wasn't added later. You will need to physically inspect the lines.
The actual problem is that you do not have hot coolant properly circulating through the core. With the engine fully warmed up, both hoses should be too hot to touch for more than a very very short time as the circulating coolant should be 190F+.
Typical causes are low coolant, air bubble in the heater core loop, kinked or faulty hose, clogged heater core, or a worn out pump.
Ford didn't install a shutoff-valve from the factory in the half ton pickups, but that doesn't mean one wasn't added later. You will need to physically inspect the lines.
If one is hot and one is stone cold, that's a different story... and the heater core could be clogged.
EDIT: To the OP:
Do you mean that you physically cycled the door with the truck warmed up, and the heat vents on High? Or that you just just moved it, then reassembled it. If the former, then projectSHO is onto something.
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