No heating

[sk47]

Had similar on a Mondeo once and the climate control had got confused - resetting fixed it. maybe worth disconnecting the battery for a bit to see if that fixes it - would be a lot easier if it did!

Hello; Not a bad suggestion. Unhooking the battery for a bit has fixed some issues for me and others. It is a simple thing to do.

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[GR11M]

I literally just dove into the passenger footwell to take a look, there looks to be 2 actuators, I'm assuming for left and right. I'm not getting heat on either side, so it would seem strange for them both to fail at the same time. There were a few other components connected to them, I forgot to take my phone, so I'll have to go back to grab photos of the part numbers.

 

[sk47]

I literally just dove into the passenger footwell to take a look, there looks to be 2 actuators, I'm assuming for left and right. I'm not getting heat on either side, so it would seem strange for them both to fail at the same time. There were a few other components connected to them, I forgot to take my phone, so I'll have to go back to grab photos of the part numbers.

Hello; Maybe but the door you can see inside the car are for directing the flow after air is inside the passenger compartment. Those of us who suspect the doors being out of whack are thinking the culprit will be a door which controls the flow from the heater box to the outside of the car.

My take is about summer driving. Since there is always hot coolant in the heater core that heat needs to be directed away from the interior. My understanding is a door often opens to send the hot air to the outside often at the cowling in front of the windshield. That way the heater core acts like a secondary radiator during warm weather. My guess at this point is during winter when you want some heat inside the car that door and perhaps some others are not getting into position so the hot air is still being directed to the outside.

 

[Gregs24]

I literally just dove into the passenger footwell to take a look, there looks to be 2 actuators, I'm assuming for left and right. I'm not getting heat on either side, so it would seem strange for them both to fail at the same time. There were a few other components connected to them, I forgot to take my phone, so I'll have to go back to grab photos of the part numbers.

I can feel CTRL-ALT-DEL coming on!

 

[GR11M]

So which side of the firewall will the heater door be found ?

 

[Slopoke]

Dual or single controls? I mean, do you have temp control for the drivers and passengers side separate?

 

[sk47]

So which side of the firewall will the heater door be found ?

Hello; On my two current vehicles the heater core is on the passenger side of the firewall inside of a box with doors. I do not know exactly how many doors. The doors open and close in some pattern which depends on the setting I pick for ventilation, for heat, for AC. In addition I can direct the air flow to be on my feet or on the windshield or from the center ports of the dash or some combination of those.
I do not know how many such doors exist in a Mustang. Likely some do a dual purpose in all the various combinations. I am guessing that the doors are a thing to suspect for your lack of heating after your report that the hoses feeding the heater core both get hot. My guess is the doors are somehow in the summer mode so the heat in the heater core is being sent to the outside of the car.
Here is a thing to check. do you get good AC currently?
Have you tried various settings of the dash controls to see if the air seems to change where it blows from?
Have you tried the heat setting with the recirculation setting at the same time?

Back to your question about the heater doors and where they are found. My guess is most of the doors used in the heat mode are under the dash. If you want heat with some fresh air a door to the outside will be partly open. If you want max heat use the recirculate setting and that should close the door to the outside all the way and only allow cabin air to run thru the heater core. I am far away and not on the scene so am guessing.

One more guess. Look up the cabin air filter for your car and where it is located. Often behind the glove box. Check that cabin air filter. It may be clogged up. I know that when i clean mine the AC cools much better. At the very least you may get some idea of how the duct work and doors are located.

Good luck

 

[sk47]

(1) having to turn heater way up to get hot | 2015+ S550 Mustang Forum (GT, EcoBoost, GT350, GT500, Bullitt, Mach 1) - Mustang6G.com

Hello; A new thread with a problem similar to the OP's. Among the last posts is one about a blend door control known to be a problem. Might be worth a look.

 

[GR11M]

UPDATE:

So it looks like there's 4 actuators, I've rotated and relabeled this diagram of a LHD; the ones that are failing on mine are 3 and 4. I removed the actuators and manually closed the flaps and the heat returned. I managed to realign the cogs on the passenger side and seems to be working, just need to sort the drivers side.

 

[Slopoke]

UPDATE:

So it looks like there's 4 actuators, I've rotated and relabeled this diagram of a LHD; the ones that are failing on mine are 3 and 4. I removed the actuators and manually closed the flaps and the heat returned. I managed to realign the cogs on the passenger side and seems to be working, just need to sort the drivers side.

If you've managed to access the blend doors, I'd recommend changing them with new ones. The blend doors are known to be an issue. I've not paid attention to the blend doors on the Mustang, but the Fiesta ST platform that I had, the message board had a lot of people having blend door failures. It usually starts with clicking noises, then failure.

I'm glad you got your issue sorted out.


https://www.mustang6g.com/forums/search/3029682/?q=blend+door&c[title_only]=1&o=date

https://www.fiestastforum.com/search/182674/?q=blend+door&c[title_only]=1&o=date

 

[GR11M]

That was a question I was going to ask, all the YouTube videos had people replacing them, so I wasn't sure if they could be realigned. The motor in the first one seems to be working fine. Are the replacement actuators any better ?

 

[Slopoke]

That was a question I was going to ask, all the YouTube videos had people replacing them, so I wasn't sure if they could be realigned. The motor in the first one seems to be working fine. Are the replacement actuators any better ?

Some people have replaced their actuators more than once. I don't know if the OEM or third party ones are better than another in terms of durability.

 

[GR11M]

My heater door actuator FR3B-19E616-BA has been replaced with FR3B-19E616-E, so maybe there's been some improvements; there also looks to be after market actuators.

 

[GR11M]

I realigned the cogs on both passenger and driver side actuators and the heating is working again.

 

[Slopoke]

I realigned the cogs on both passenger and driver side actuators and the heating is working again.

If the gears got out of alignment, that means the plastic gears are starting to wear and it'll fail again. Just food for thought.

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