Don't quite understand the climate control system

For ease of use, leave on AUTO and set to desired temperature. That's the way Toyota intended it to be used. If you wish to experiment, it's an exercise in futility. Here's what I do.

I usually want fresh outside air, warm in the morning and ambient in the afternoon. And so in the afternoon I turn on the fan to turn on the HVAC. I quickly turn temperature to LO.

I don't use AUTO or AC because air conditioning might turn on. In the morning I do the opposite and turn up the temperature for heat.

I only use AUTO when it is hot and I need air conditioning. And yes, in the summer, I just set it to desired temperature and let it do its thing. I never use the AC button except to turn it off. Sometimes it's lighted when I want heat which bugs me.

If you had it set at 68 degrees in refresh in summer and the HVAC is off, hot air will come in. In other words, if you don't use AUTO, anything above LO is heat.

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if you set the temp to low, turn a/c and autu buttons off, set vent to outside/fresh, and set fan to your desired speed, you will get fresh outside air with unchanged temp.

 

A/C is air conditioning of course, but what it generally means is conditioning the air to be favorable for people. In cars, this usually means dehumidifying the air. Please correct me if I'm wrong, anyone.

When you put the unit on Auto, you're telling the car to maintain the temp you have set. The car will do this by increasing or reducing the fan speed to get you there within a specific rate that Toyota sets up in the A/C's computer (the further the interior's temp is from what you set, the faster the fan speed, etc.)

I believe the car also determines if the outside air is too humid or not, and if it finds it to be, it will activate recirculation so it can keep the air "conditioned" with the A/C system on (to dehumidify). If it's nice outside, it will turn off the recirculation and just function normally.

If you want fresh air but no change in temp, set the temp and hit Auto, and then turn off recirculation if it ever comes on.

Beyond this, the car will also send warm air to the lowest vents, and cool air to the highest vents, as this is what is most efficient for heating/cooling the car respectively.

 

Set to desired temperature and then turn it off. The car will attempt to provide this temperature to the best of it's fanless airflows ability.

 

The temperature control valve will stop at the position whenever you turn the system off.
That was why both A/C and AUTO buttons are off you still get heat...

 

Well that clears things up....

 

it's only 50 pages of the manual, what the question again?

 

If you hit the defrost button and have it solely on defrost, the fan acts weird, almost as if you hit Auto.

 

you can shut down the upper vents if they are like the liftback, that will force more air to the feet.