#1  
Old 11-12-2019, 01:21 PM
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michaelroy michaelroy is offline
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Default Heater A/C controls

I have a 65 GTO w/ A/C. I have never used the heat. I have a valve closing off water to heater core.
I tried to use my heat and opened the valve. Apparently I never attached the cables to the heater box.
My question is there 2 or 3 cables from control to box. Is there any sort of vacuum needed to facilitate operation of heater???
Think I can access cables and box by removing glove box?

  #2  
Old 11-13-2019, 08:35 PM
jtea64 jtea64 is offline
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You definitely need vacuum to operate the system properly. Attached diagram shows the air doors. Some are operated by vac.

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Old 11-13-2019, 08:38 PM
jtea64 jtea64 is offline
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Maybe this will put the file up.
Attached Files
File Type: pdf 65GTOheater.pdf (125.7 KB, 48 views)

  #4  
Old 11-13-2019, 08:47 PM
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OG68 OG68 is offline
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A/C cars have one cable for temperature control.
All other functions are controlled by vacuum.
See attached charts from the restoration guide.

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Old 11-14-2019, 12:03 PM
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michaelroy michaelroy is offline
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Default HTR.

Thank you guys for responding. That vacuum diagram is what I needed.
BTW I found my restoration guide. Hoped I wouldn't have to use it anymore.

What opens the doors vac. or the cable?

  #6  
Old 11-14-2019, 12:50 PM
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Tom Vaught Tom Vaught is offline
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If I read the Pictures correctly, the Cable changes the position of the "Cam Profile"

The "Cam Profile" opens or closes Vacuum Switches that control the Vacuum Diaphragm Actuators, somewhat like a Vacuum Tri-Power set up works.

Either the Vacuum Switch is supplying vacuum to the actuator or it is venting the actuator and the actuator goes to the rest position.

Tom V.

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  #7  
Old 11-14-2019, 03:48 PM
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michaelroy michaelroy is offline
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ok thanks. I need to make the temp lever move more freely. When I manually push the cable all the way to warmer, I have good heat!
Haven't worked on the old girl in a couple of Winters when I pulled the engine and had a new rear main seal Installed.

Got a new addition to the Garage so I work on the Vette some now. Goat is 10 times the car that I've added.
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