Heater Woes
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Mountain Pass
Joined: Apr 2002
Posts: 230
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Heater Woes
A while back, I replaced my heater valve. Everything seemed to work. When the heater was off, the heater was off and vice versa.
Lately, I've noticed that my heater blows fairly hot air even when the heater is off. And unfortunately, air still comes thru even if I have the heater control to off (as opposed to heater or defrost.)
So I replaced my heater valve. I even tested the new heater valve and saw that I couldn't get air to pass thru it when closed. But once on the truck, same thing: I get hot air blowing when the heater is on cool. Now it is significantly cooler than when the heater is on warm, but it's pretty uncomfortable now that the weather is getting warmer.
It seems like a pretty simple circuit. I mean, I've considered whether I might have the valve on the wrong hose, or the hoses going to the wrong side of the heater core.
Any ideas?
Lately, I've noticed that my heater blows fairly hot air even when the heater is off. And unfortunately, air still comes thru even if I have the heater control to off (as opposed to heater or defrost.)
So I replaced my heater valve. I even tested the new heater valve and saw that I couldn't get air to pass thru it when closed. But once on the truck, same thing: I get hot air blowing when the heater is on cool. Now it is significantly cooler than when the heater is on warm, but it's pretty uncomfortable now that the weather is getting warmer.
It seems like a pretty simple circuit. I mean, I've considered whether I might have the valve on the wrong hose, or the hoses going to the wrong side of the heater core.
Any ideas?
all alone in the world
Joined: Feb 2002
Posts: 2,038
Likes: 1
From: oklahoma
some heated water will bypass the valve no matter what you do, this keeps the core flushed out sorta.
if you take the fresh air vent off the passenger side, you will see that the vent door does not completely block the air from the heater core. this lets air blow across the core all the time.
about the only way to completely stop the heat is unhook the hoses to the core, but this is not a good idea. the heater core needs the flow to keep corosion from starting to eat it up.
i just installed 2 valves on mine, and that helped immensly. slowed the flow rate down even more without completely stopping it. still gets a little warm in there with the vents open and the windows down.
jim
if you take the fresh air vent off the passenger side, you will see that the vent door does not completely block the air from the heater core. this lets air blow across the core all the time.
about the only way to completely stop the heat is unhook the hoses to the core, but this is not a good idea. the heater core needs the flow to keep corosion from starting to eat it up.
i just installed 2 valves on mine, and that helped immensly. slowed the flow rate down even more without completely stopping it. still gets a little warm in there with the vents open and the windows down.
jim
Freshman User
Joined: Jun 2004
Posts: 40
Likes: 0
Jimbare is right there is some minimal flow required through the core, otherwise it will corrode- then when you want/need it there will be no heat. This heat shouldn't really be noticable though. As previously stated make sure the actuator on the valve strokes full closed; pop the cable off the valve in the shut position and shove it more closed if it moves adjust your cable accordingly.
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Stang_Shane
1997 - 2006 Expedition & Navigator
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Jan 9, 2017 06:15 AM
