2024 Lariat - Heat Not Working Well

[TaxmanHog]

It doesn’t but I come from a humid climate. Turn on recirculation with air conditioning on. The dryer will take the moisture out of the cabin.

Precisely the correct way to manage moisture in the cool season, most folks have been freaking out when they see the AC lamp illuminated, manually turning it off prevents the dehumidification cycle to run.

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[Altivec]

Precisely the correct way to manage moisture in the cool season, most folks have been freaking out when they see the AC lamp illuminated, manually turning it off prevents the dehumidification cycle to run.

Yes, anytime you need to get rid of humidity in warm or cool weather, A/C with recirc is the way to go. Sometimes I have my A/C and my heat on at the same time. But when it drops below freezing, I don't think running the A/C is a good idea. DatOleMan said, to turn the recirc on because it takes a lot of energy to heat the cabin with outside cold air. As I mentioned, if I do that where I live (Canada) in winter, all the windows will frost up in minutes. I am pretty sure that is the reason the recirc setting doesn't stay on. They don't want people that have no clue, to all of a sudden, not be able to see out their window because someone left the recirc on.

In saying that, I hope Ford starts upping their game in software. I like Recirc on in the summer because I have allergies. It should be fairly easy for the truck to know if it's in freezing outside or not. If its not, the setting should stick.

 

[Firn]

Yes, anytime you need to get rid of humidity in warm or cool weather, A/C with recirc is the way to go. Sometimes I have my A/C and my heat on at the same time. But when it drops below freezing, I don't think running the A/C is a good idea. DatOleMan said, to turn the recirc on because it takes a lot of energy to heat the cabin with outside cold air. As I mentioned, if I do that where I live (Canada) in winter, all the windows will frost up in minutes. I am pretty sure that is the reason the recirc setting doesn't stay on. They don't want people that have no clue, to all of a sudden, not be able to see out their window because someone left the recirc on.

In saying that, I hope Ford starts upping their game in software. I like Recirc on in the summer because I have allergies. It should be fairly easy for the truck to know if it's in freezing outside or not. If its not, the setting should stick.

Although cold air is more dry, you also have to replace a LOT of the warm humid air with cold dry air. It's likely far better to condition the air you have, than to exchange it with outside air.

To expand on that, if the air inside is warm and humid then they only thing you have is to exchange it with outside dry air, which you now have to heat up from whatever temp it is at (so, say -10f). Alternately the hvac only has to get cold enough to cause the humidity to condense on the heat exchanger, which only needs the heat exchanger to reach the dew point (which could be as high as +50f for an air temp of +70f). So the question becomes, what is more efficient, heating -10f air to 70 degrees, or cooling 70f air to 50f, and then heating it back to 70f?

 

[newbieLightning]

Exact same issue with my new 2024 XLT. Following closely. Calling the dealer today.

 

[Altivec]

Although cold air is more dry, you also have to replace a LOT of the warm humid air with cold dry air. It's likely far better to condition the air you have, than to exchange it with outside air.

To expand on that, if the air inside is warm and humid then they only thing you have is to exchange it with outside dry air, which you now have to heat up from whatever temp it is at (so, say -10f). Alternately the hvac only has to get cold enough to cause the humidity to condense on the heat exchanger, which only needs the heat exchanger to reach the dew point (which could be as high as +50f for an air temp of +70f). So the question becomes, what is more efficient, heating -10f air to 70 degrees, or cooling 70f air to 50f, and then heating it back to 70f?

I never thought of that. I was always told not to use your A/C below freezing because you can damage it. But I was told that for my home A/C. I just assumed that would apply to my cars A/C as well. It would make sense that a vehicle's A/C is more robust to handle extremes like that though. I would definitely need to do more research before I would attempt it.

Then there is, as you mentioned, the efficiency. Is it more efficient to heat dry cold air from outside or use the A/C compressor to condition and reheat inside air. I am thinking not because why wouldn't EV manufactures promote it as a more energy efficient way of heating the cabin. I'll have to search and see if anyones done a YouTube on this. I'll be damned if I've been heating my vehicles wrong all these years.

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