No Heat
Thread Starter
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Mountain Pass
Joined: Sep 2010
Posts: 132
Likes: 5
No Heat
Hi all. 2010 ford f-150, XLT, 5.4, 4x4, XTR
So my heater stopped working. It’s likely a faulty thermostat, a clogged up heater core or the heater core itself isn’t working properly (or something else I’m not aware of).
Could someone advise me on which hoses to check (going into the firewall) for each particular issue?
Possible hint: when I turned on the heat and noticed it wasn’t working, the fan was shooting out some particulate matter from inside the system. Not a lot, but I was reminded of my previous F-150, which lost heat and began to spit out a similar dusty substance (albeit to a much greater degree). A system flush worked like magic then. I wonder if that’s the case here.
Responses greatly appreciated. 👍🏻
So my heater stopped working. It’s likely a faulty thermostat, a clogged up heater core or the heater core itself isn’t working properly (or something else I’m not aware of).
Could someone advise me on which hoses to check (going into the firewall) for each particular issue?
Possible hint: when I turned on the heat and noticed it wasn’t working, the fan was shooting out some particulate matter from inside the system. Not a lot, but I was reminded of my previous F-150, which lost heat and began to spit out a similar dusty substance (albeit to a much greater degree). A system flush worked like magic then. I wonder if that’s the case here.
Responses greatly appreciated. 👍🏻
More Turbo
Joined: Aug 2006
Posts: 581
Likes: 72
From: Double Oak, TX
Very possible, a very very common problem, blend door motor. Does your truck have single or dual (driver and passenger) zone temp control?
i would doubt thermostat or cooling cooling system problem if you're not having overheating problems.
i would doubt thermostat or cooling cooling system problem if you're not having overheating problems.
More Turbo
Joined: Aug 2006
Posts: 581
Likes: 72
From: Double Oak, TX
on a dual zone system, you have a total of 4 blend door motors, including 1 for each side/zone to control temp. If you had a dual zone, "A" blend door failure would mean that only one side/zone would lose temp control.
on a single zone system, you only have a total of 3 blend door motors, 1 being for temp control of both sides.
its a very common failure and many, many threads out there. Mine failed a couple years ago, not a real expensive part and not a real hard DIY fix, if you don't have real large hands. The blend door in question isn't in the easiest to get to place behind the glove box up by the radio. One screw in picticular is a real pain.
Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,079
From: St Louis
Go back to your original idea of checking the heater hoses at the firewall first. Dinking around with the actuators under the dash is pointless if HOT coolant is not flowing through the heater core. To assume that the cooling system is working correctly since the engine is not indicating it is not overheating is not a good assumption.
And, there is a single temperature actuator on a single zone system and two temperature blend actuators on a dual zone system. The other actuators are for airflow direction, not temperature blending.
The foreign material expelled from the outlets was likely from a rotted foam seal. It is entirely possible that a seal has failed and has jammed the temperature blend door. However, check the hoses first.
And, there is a single temperature actuator on a single zone system and two temperature blend actuators on a dual zone system. The other actuators are for airflow direction, not temperature blending.
The foreign material expelled from the outlets was likely from a rotted foam seal. It is entirely possible that a seal has failed and has jammed the temperature blend door. However, check the hoses first.
Thread Starter
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Mountain Pass
Joined: Sep 2010
Posts: 132
Likes: 5
Thanks
Thanks for the responses. I’m going to investigate the hoses and do some sleuthing.
I have a feeling it’s the actuator; there’s a good YouTube video on how to swap it out). I’ll post my findings.
I have a feeling it’s the actuator; there’s a good YouTube video on how to swap it out). I’ll post my findings.
Thread Starter
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Mountain Pass
Joined: Sep 2010
Posts: 132
Likes: 5
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More Turbo
Joined: Aug 2006
Posts: 581
Likes: 72
From: Double Oak, TX
yep, like stated above, a very, very common failure on our trucks.
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