A/C Air Mix Question

[DanFelix]

Does the a/c mix heater air to achieve the set temperature (and then send it out the vents) or does it cycle in and out to maintain the set temp in the cabin? Thanks.

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[PBosch]

Does the a/c mix heater air to achieve the set temperature (and then send it out the vents) or does it cycle in and out to maintain the set temp in the cabin? Thanks.

It mixes it

 

[roaniecowpony]

There is actually a door in the HVAC housing called a mixing or mixer blend door. Even old manually controlled systems had this kind of mixing function.

 

[TA1ton]

Does the a/c mix heater air to achieve the set temperature (and then send it out the vents) or does it cycle in and out to maintain the set temp in the cabin? Thanks.

Depends on if you are in the auto setting on the climate controls. When in auto, it will cycle on and off as well as switch between heat and a/c to maintain the set temperature. When not in auto, it just mixes air and sends it out the vent at the set temperature. At least that’s the intent…

*edit: forgot to mention that the air mixing does occur in auto mode too, but it will also cycle as stated.

 

[roaniecowpony]

Depends on if you are in the auto setting on the climate controls. When in auto, it will cycle on and off as well as switch between heat and a/c to maintain the set temperature. When not in auto, it just mixes air and sends it out the vent at the set temperature. At least that’s the intent…

*edit: forgot to mention that the air mixing does occur in auto mode too, but it will also cycle as stated.

It's still unclear to me, with these climate controlled systems, if the AC compressor is in a routine duty cycle, maintaining the evaporator at the coldest temperature, while the mixer door controls vent output temps, even when it's cold outside. Once it gets cool around here, I'll have to check to see if the compressor is in its duty cycle, even when the set temp, in AUTO mode, is well above the ambient cabin and outside temps.

In my old cars with manual controlled systems, it's my understanding that when you put it in defrost, the AC system was activated to dehumidify the air first, by cooling it, then heating it to provide warm dry air. This maintained clear windows during those cool/cold rainy days.

 

[DanFelix]

It mixes it

PBosch: Thanks. The temp mix is downstream of any inside/outside mix. The old Xterra did this as well.

 

[roaniecowpony]

I have the Tech Authority manual and it has an imbedded video (or so it states), on how the system works, but it doesn't seem to run.

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