WTF does Max A/C do?

[101lifts2]

Originally Posted by Particle Man

bzzzzzzzzt- sorry, but thanks for playing. Tell him about his fabulous door prize, Al!

(just selected "MAX A/C" and turned the Temp into the red zone and, woe and behold, hot air came out)

Not trying to bust your balls (okay, maybe a LITTLE) but not all cars function the same way.

Are you just acting stupid? You just turned the heater control knob to full hot. No shit it is gonna blow hotter when you turn it all the way hot. But do you need a label that says "Max AC" to tell you that putting it all the way cold puts the door vents fully to the evaporator? Is it not obvious? The answer is NO. My point is the label Max AC does nothing IF you have a recirc button.

Would you like a Max Hot label too?

[fasternyou929]

Originally Posted by 101lifts2

Are you just acting stupid? You just turned the heater control knob to full hot. No shit it is gonna blow hotter when you turn it all the way hot. But do you need a label that says "Max AC" to tell you that putting it all the way cold puts the door vents fully to the evaporator? Is it not obvious? The answer is NO. My point is the label Max AC does nothing IF you have a recirc button.

Would you like a Max Hot label too?

Still wrong. If I have my A/C running in my truck (Nissan), car (Mazda), or SUV (BMW) with Recirculate ON, then switch to MAX, you can HEAR the changes to the air speed. Exactly what that change is, I don't know, but it's clearly doing something more than recirculating.

And the Nissan will modulate the auxiliary cooling fan when normal AC is on, whether or not recirculate is active. It runs 100% of the time MAX AC is selected. Whether it's the same on the others, I don't know, my wife drives them more than me.

So, clearly not all AC systems are created equal. The only thing more clear is this subject has run its course several times over. Should you feel the need to "debate" this further, please PM ParticleMan.

[101lifts2]

Originally Posted by fasternyou929

Still wrong. If I have my A/C running in my truck (Nissan), car (Mazda), or SUV (BMW) with Recirculate ON, then switch to MAX, you can HEAR the changes to the air speed. Exactly what that change is, I don't know, but it's clearly doing something more than recirculating.....

It's forcing the air out of only the center vents...but you could have just PUT it on the center vents.

....And the Nissan will modulate the auxiliary cooling fan when normal AC is on, whether or not recirculate is active. It runs 100% of the time MAX AC is selected. Whether it's the same on the others, I don't know, my wife drives them more than me....

Remove your HVAC control head and then turn the thing ON to Max AC. If there is a different signal being sent in Max AC, then I'll agree that there must then be varying high side pressure ranges to run the condensor fan.