Blower fan question

[Redsoxx1918]

2016 SR5 premium here. When I turn the temp knob all the way clockwise, for heat, and turn the blower fan all the way up, I get a decent amount of airflow. But.....if I back the temp control off just one click, airflow increases substantially. Anyone else notice this???


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[Redsoxx1918]

I guess I'm the only one. I'll have the dealer check it out at my next service appointment.

 

[philsey]

I'm hesitant to believe something's broken. Have you carefully read the owner's manual on the HVAC system?

 

[Friggin Idiot]

I may not be exactly right on with this.
But basically after the blower motor there are two chambers, one for the heater core the other for the a/c. Setting the temp knob to full heat will completely block airflow through the a/c side, leaving the blower motor running into back pressure from that chamber. Once you click it down one notch, it allows the a/c side to open up a little, relieving that back pressure by giving air in that chamber somewhere to go. The air in that chamber is not being chilled unless you have defrost or a/c on, so it's just adding a little ambient air back into the mix.

 

[Redsoxx1918]

Ah....that makes sense.


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