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-   -   MARK IV AUTO AIR CONDITIONING (https://forums.maxperformanceinc.com/forums/showthread.php?t=885216)

1969GTO 04-30-2026 03:55 PM

MARK IV AUTO AIR CONDITIONING
 
I found some paper work in my 68 GTO that I need some help with.
The paper work is the owners warranty card and customer receipt from 02/18/1970 at 11,656 miles on the car.
My question is if someone might know how the a/c unit was plumed to drain the condensation away from under the dash to the out side?
I don't have the unit and don't want one, I found 2 small holes just past the center console in the floor [ hump area].
The kit number is 754823297041, compressor number: K34119.
The unit was installed in Nebraska for the original owner.

Thank you for your help.

OG68 05-01-2026 12:20 PM

3 Attachment(s)
I recently added a MK IV unit to my car. Instructions from Vintage Air say to drill a hole under the evaporator to drain the condensate.

1969GTO 05-01-2026 02:34 PM

Good info, thank you, my car in that tunnel area looks like two bullet holes shot from inside the car with maybe a 38, not two nice drill holes.
I don't really believe a pistol was used because I can tell that the t-400 was never removed and it is original to the car.
Unless some idiot used a zip gun to punch through the floor.

hgerhardt 05-01-2026 02:58 PM

Quote:

Originally Posted by 1969GTO (Post 6614299)
Good info, thank you, my car in that tunnel area looks like two bullet holes shot from inside the car with maybe a 38, not two nice drill holes..........

Probably used a center-punch with a hammer to make the holes. Made that way, the hole won't have sharp edges to cut the hose, plus that style of hole would make the hose easier to insert. (that's what she said)

OG68 05-01-2026 06:14 PM

The Vintage Air drain line comes with a T to connect both MK IV drain pipes

1969GTO 05-02-2026 12:46 PM

OG68: Did they have the T idea in 1970? or possibly some clown couldn't decide which side to put the drain holes on?
The hammer hole sounds about right, told the new guy to just hammer a couple of holes in that black carpet............


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