Heater duct problem!
Thread Starter
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Mountain Pass
Joined: Mar 2002
Posts: 111
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Heater duct problem!
Hi all, I have this 2018 F450 with a 6.7 powerstroke and when you turn the heat on, I have good heat coming out the passenger side, but only a little heat coming out the drivers side vent or defrost, makes no difference which setting you put it on. Thought I would check here to see if anyone has come across this. It is out of warranty. Did the basic checks, coolant, made sure the heater blend door opens and closes good, left the little motor off and just left it in the hot position for now. The vent control is working, I can make it go from defrost to vent to heater good. If I put it on vent and close the vents on the passenger side, it does give more heat to the drivers vents.
Tuned
Joined: Sep 2020
Posts: 322
Likes: 100
If you referring to the little controller motor, I am not sure if it's specific to diesels only. It would seem to me that it would be common to both gas and diesels. Hopefully there is a Ford Technician who can chime in.
Seems like this controller motor is located in a very vulnerable location and was my first thought when I read the original post.
Seems like this controller motor is located in a very vulnerable location and was my first thought when I read the original post.
Tuned
Joined: Jan 2021
Posts: 345
Likes: 92
If you referring to the little controller motor, I am not sure if it's specific to diesels only. It would seem to me that it would be common to both gas and diesels. Hopefully there is a Ford Technician who can chime in.
Seems like this controller motor is located in a very vulnerable location and was my first thought when I read the original post.
Seems like this controller motor is located in a very vulnerable location and was my first thought when I read the original post.
Tuned
Joined: Sep 2020
Posts: 322
Likes: 100
I wonder if there is one of these little controllers directing or diverting air from a supply source to the windshield vent, the dash vent and the floor vent. If there is another controller motor, like the one in the video, maybe it is not getting full rotation and getting stuck in between two exit vents paths.
Tuned
Joined: Sep 2020
Posts: 322
Likes: 100
Germanrazor and msta999
I was curious about where Driver Side Temperature Door Actuator was located and took a look at my repair CD. Turns out the actuator discussed in the video posted above is the one that control the vent for the driver side, even though it is located under the dash on the passenger side. Looks like that may be a good place to start to resolve your issue.
I was curious about where Driver Side Temperature Door Actuator was located and took a look at my repair CD. Turns out the actuator discussed in the video posted above is the one that control the vent for the driver side, even though it is located under the dash on the passenger side. Looks like that may be a good place to start to resolve your issue.
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Mountain Pass
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Postmaster
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From: BC Canada
Yes, depends on dual control heat mode if you have it or not. Turn off dual control, see what you see on each side by measuring the air temp. If its the same, its the dual control blend door. Mine blows flames both sides as selected.
Laughing Gas
Joined: Dec 2019
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From: MA
Don't disappear w/o letting us know.
Thread Starter
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Mountain Pass
Joined: Mar 2002
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That is what I was thinking, but the only seems to be one control for the heat blend door. I'll do a heater core flush first and see if I notice anything, then I may do the TSB, which calls for replacing the heater core and flushing the cooling system. I did order a blend door motor and cam, just to eliminate that possibility.
Laughing Gas
Joined: Dec 2019
Posts: 863
Likes: 35
From: MA
That is what I was thinking, but the only seems to be one control for the heat blend door. I'll do a heater core flush first and see if I notice anything, then I may do the TSB, which calls for replacing the heater core and flushing the cooling system. I did order a blend door motor and cam, just to eliminate that possibility.
Thread Starter
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Mountain Pass
Joined: Mar 2002
Posts: 111
Likes: 2
I removed the blend door accuator and moved the control by hand and it didn't change anything. Like I mentioned before, there is a TSB for the heater core becoming partially plugged, so when they can drop the truck off, we'll check that...