AC starts on it's own randomly...

[National Superbike]

About the only thing "manual" in these trucks are the rear door windows and the rear sliding window. Everything else is completely computer controlled despite what control panel they put into the truck (or if you have human operated levers like a non-power seat). The computer can't control the XLT's power seats, but it can in other trims. I upgraded my seats and the memory function works as it should moving the seat.

I understand... by manual, I mean that it isn't a set and forget automatic climate control. I specifically wanted the STX for the seats- manual with lumbar. I'm the only driver and they may actually never move unless someone borrows the truck.

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[blazef150]

Have you noticed this with your truck? Being a STX it also has manual AC and living in Charleston similar or worse humidity than Atlanta... I've had a LOT of cars and trucks and this is the first one that has done this with the AC.

Yes, My STX does this also. The GMC I had before also did this in manual mode to keep the cabin area dry.

 

[powerboatr]

double down
its the system protecting the inside items...from excess humidity, which can cause electronics to work weird and make for moldy smells etc
its pretty normal
my dads maverick does it ALOT
the ac will come on cold for a few minutes if you drive with the vent on and ac off,
i find it does it as the truck starts to feel uncomfy and all that
then i switch it on and tell him to wear a coat

 

[Tall Tail]

Thanks for finding those threads... I will say, it is annoying- yesterday morning it was 64 deg and foggy and it did it and I had no need for it at all. The air gets super cold and the only solution is to turn the system off with the power button. I'll still run it by my friend at the dealer and see what he says and report back. He told me one time that he wouldn't buy any F150 newer than a '16 since all he does all day is chase down electronic and electrical problems on the newer trucks- but this may actually be normal, I guess.

Did you ever take any action on this? My 2022 did it for the first time yesterday. I don't live in a particularly hot or humid climate and there was nothing unique about the conditions.

 

[SilverPigeon]

I understand the concerns raised; what I don't understand is: when the A/C switches on and makes the air too cold, why aren't people turning the heat knob up? In this configuration, A/C is still de-humidifying. ?‍

 

[Tall Tail]

I understand the concerns raised; what I don't understand is: when the A/C switches on and makes the air too cold, why aren't people turning the heat knob up? In this configuration, A/C is still de-humidifying. ?‍

The temperature problem is solvable; however, the solution creates more problems.

1. Frequent temperature adjustments based on random unexpected cycling
2. Reduced cabin humidity may not be needed/wanted
3. Inefficiency and loss of mpg
4. Wearing out the compressor and other components.

It would be optimal if Ford stopped "fixing" things that aren't broken.

 

[SilverPigeon]

The temperature problem is solvable; however, the solution creates more problems.

1. Frequent temperature adjustments based on random unexpected cycling
2. Reduced cabin humidity may not be needed/wanted
3. Inefficiency and loss of mpg
4. Wearing out the compressor and other components.

It would be optimal if Ford stopped "fixing" things that aren't broken.

I am spending the next few days on "dumbing down" the HVAC module. Ran a control test today and modification tests to come. I'll make a separate thread when I have all the data. I'm hoping for extended recirc times.

 

[94stang]

I have a new 23 STX with manual HVAC and it will randomly turn the compressor on even when the AC is off and it is just blowing outside temp air in. If I turn the entire system off with the power button, it will usually go back to normal but will do it again later in the day of the next day. If the AC button isn't pushed, how can it even do that?

Ive noticed my new to me '22 STX doing the same thing. Thought something might be wrong, but i guess not.

 

[SilverPigeon]

Those interested in extended recirc. times, I've started getting results here: https://www.f150gen14.com/forum/threads/extending-hvac-recirculation-times.40851/

 

[National Superbike]

It was 67 last night and driving home I just had the vents on. AC starts on its own and instantly 40 deg air coming out of the vents. What was Ford thinking with this "feature". I had to just turn the whole system off and open the window. This problem alone is making me consider a different truck, it is so annoying. Plus the creaky, rattlely interior.

 

[Tall Tail]

In manual HVAC mode, is there a range between the measured outside temperature and the cabin temperature setpoint that doesn't activate the heater or the AC?

For example, if the truck measures 75 deg F outside, and i set the cabin temp to 75F.
Then the outside temp changes to 74F does the trucks HVAC control system turn on the heater because the cabin setpoint is still 75F even if the HVAC system is not set to auto?

Conversely, in manual HVAC mode, if the the cabin temperature is set to 75F and the outside temperature changes from 75F to 76F, does the truck turn on the AC?

 

[SilverPigeon]

As you see from the logs in the other thread, ambient temps lower than dial temp by approx. 10°C do not engage the A/C if in manual + recirc. I haven't tested this with manual + fresh as it's not the aim of the other thread, but I would expect it to be the same way.

i will need to wait until late spring summer before i can test for ambient temps 10 ° C higher than dial temps in manual.

There may indeed be a small range where this logic isn't used, but someone needs to test that theory.

 

[Texas2022XLT]

It was 67 last night and driving home I just had the vents on. AC starts on its own and instantly 40 deg air coming out of the vents. What was Ford thinking with this "feature". I had to just turn the whole system off and open the window. This problem alone is making me consider a different truck, it is so annoying. Plus the creaky, rattlely interior.

You’d think if they can make this happen they would have the fan come on when you turn the truck off to dry the evaporator to prevent the mold/dirty sock smell folks get from water on the evaporator.

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