Max air conditioning function
Thread Starter
Instructor
Joined: Jul 2011
Posts: 109
Likes: 3
Max air conditioning function
I have read other posts about this function on a C3 (1980) and I did a vacuum test on both accuators , they both function and hold vacuum. With my car running and Max air is selected both doors open and when normal air conditioning is selected both doors close. Other posts say the opposite.
Race Director
Joined: May 2006
Posts: 18,668
Likes: 2,564
Have you used this chart to diagnose whether the hoses are correctly set up on each port and that in Max position they function as described, either VAC or VENT
http://repairs.willcoxcorvette.com/w...-schematic.pdf
http://repairs.willcoxcorvette.com/w...-schematic.pdf
Instructor
Joined: Jan 2014
Posts: 214
Likes: 36
From: Sydney NSW
I have a 79 and when Max air is selected the door is closed (ie air recirculates inside the car) and when normal air conditioning is selected door is open (ie fresh air is pulled into the car). This aligns with the GM service manual I have.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,114
From: Crossville TN
MAX air is basically same as normal, except the outside air intake is closed so there is no 'fresh' air exchange. That allows the 'trapped' air in the cabin to circulate and RE-cool until you feel it is cool enough inside to move it to 'normal' position.
