A/C Questions
Thread Starter
5th Gear
Joined: Nov 2007
Posts: 5
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A/C Questions
Been working on the A/C in my '72 while I have the dash apart and I'm stumped on a couple of points. # 1 - when I move the A/C control wheel to MAX A/C the vacuum moves the door open on the passenger's side OK to recirculate the air but I thought that the fan speed was supposed to go to max. Looked for the resistor or relay or whatever that's supposed to be in the engine compartment but can't locate it. So, is the fan supposed to go to max ? Anybody got a picture of where the resistor / relay is ?
# 2 - the boot in the first picture is loose from the blower cover (second picture). I've looked through my AIM and the vendors parts books and can not find it. What is it and what does it do ? (see my response below)
Thanks in advance for the help.
# 2 - the boot in the first picture is loose from the blower cover (second picture). I've looked through my AIM and the vendors parts books and can not find it. What is it and what does it do ? (see my response below)
Thanks in advance for the help.
Last edited by ettev50; Nov 6, 2010 at 05:18 PM. Reason: Pictures do not show up
Instructor
Joined: Sep 2009
Posts: 135
Likes: 2
From: Waterbury CT.
My '72 vette manual shows the resistor bank located on the heater case just to the passenger side of center inside under the dash. If your blower speed goes from low to high with the switch then the resistor bank is ok.The manual doesn't get into much theory of operation, so that's about the best I can do for you. The blower switch is located at the bottom of the console.
Melting Slicks
Joined: May 2002
Posts: 2,717
Likes: 121
From: Sulphur LA
St. Jude Donor '05-'06,'11,'13-'14,'16,'18,'19,'24, '25
When you go to Max AC it simply moves the diverter doors to recirculate the air within the cabin. You should still retain fan speed control with the fan switch.
I'm not familiar with the 72 so I can't speak to it but on newer models including my 77 there is a high speed relay mounted on the fire wall that sends battery voltage around the resister bank to the blower motor.
Neal
I'm not familiar with the 72 so I can't speak to it but on newer models including my 77 there is a high speed relay mounted on the fire wall that sends battery voltage around the resister bank to the blower motor.
Neal
