Another weird trait - fan speed

[SLJ]

Climate control is programed to keep the inside of the windshield clear. It will temporally override any of your settings to do that if it thinks it's necessary.

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[MYMAVXL]

I read your previous posts. I didn't see where you said you manually selected the fan speed I must have missed it. Sorry

No Worries at all! I should’ve stated that more clearly.
Again…this isn’t a huge issue…just wondered if anyone else noticed it…

 

[Ozarkbeard]

The climate control system is very much automated in the Maverick.

Which I very much hate. I spend more time trying to figure out WTF the HVAC is doing, and then undoing whaterver it thinks should be done that I don't want done.

The manual system in my last Subaru required much less fiddling with. It did what I told it to do. And nothing else.

 

[Glen Baker LLC]

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Which I very much hate. I spend more time trying to figure out WTF the HVAC is doing, and then undoing whaterver it thinks should be done that I don't want done.

The manual system in my last Subaru required much less fiddling with. It did what I told it to do. And nothing else.

And conversely, I love the climate control system.
I don't try and fight it. I guarantee the climate control system has far more patience than I do.
I work with it and let it work for me. Specially in the summer.
It's like trying to fight the internet. You either adapt and work with it the way it was set up by others or you don't use it.
If I search the internet for something. Using search words that I think makes sense, but the results are not what I want. I have to change my words or input to suit the internet's search criteria. Allowing the internet to now work for me.
I damn well know the internet isn't going to change for me, so I just suck it up and use it as well as I can.

 

[ABTremor]

First, Auto is not on…
Since I start with the temp on High, when I turn it down it’s because I no longer want as much heat. I would expect the fan to stay the same or even go slower, and that’s why I think it’s kinda weird that the speed goes up.
It’s just another strange but not really bothersome quality that my Mav has. I just wondered if anyone else noticed this or is my Mav “special”.

My understanding is this.. you set the temperature to max (call it 85* just for grins) the fan is also set to max (level 7).
Heat comes on full blast, fan blows like a hurricane and all is going great, now, the temperature inside the truck (wherever the sensor is) reaches the max temperature- 85* in my example - and the fan slows down to level 3 and the temerature sensor sees everything steady at our 85*. Now lets say you get in and lower the temperature set point to 80* for a reduction of 5*. Now the computer turns on the A/C and speeds up the fan to lower the cabin temperature to the new setpoint, once the new setpoint is reached the system changes the fan speed and determines if either more heat or more A/C is required to maintain the desired temperature.
Again, the auto mode does not need to be "on" because in reality it's always on in some form. Selecting auto lets the computer control the temerature setting, the fan speed AND the mix of defrost/dash/floor vents.

I don't think anything is wrong with the HVAC system, the way it acts is just a little confusing sometimes.

 

[slashsnake]

Is the fan running slower at the higher temperature to keep the temperature required?

AKA say at max speed your fan blows at a rate of 100 cubic feet of air per minute. And when it's 10 degrees outside and you want it at 85 inside, you need to heat up air 75 degrees through the heating elements... But it can only move air at up to 70 cubic feet per minute and maintain that 75 degree difference. So in order to maintain 85, it runs at level 7.

But if you lower the temp to 73... now it's only heating up the air by 63 degrees. So it can heat 100 cuft/min at that temperature, thus the fan speed increases to the setpoint (10).

That key part of heat transfer is the time. Think of it like the pizza ovens at a Dominos... They put the pizza in cool and it comes out cooked perfectly after 10 minutes. If they sped it up twice as fast, you'd get a doughy pizza, the oven can't heat it enough in that time. It might be nice to get a pizza cooked in a minute, but if the Oven maxes out at 380, that's not happening. So it has to run slower.

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