I'm putting the AC back in my 70.There is a round hole near the blower motor and I dont remember what goes there. It looks like it must have been some type of sensor or switch that was attached with a screw. Thanks for any help. Scot

I think your talking about the hose that blows air through the blower motor to cool it.

Its a 3/4"(ish) hose that goes from there to the hole in the blower motor.

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1970 Chevelle Malibu 2d

I agree with the above. It's a jumper piece that allows the motor to cool itself off.

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71' 3880# with me. Big Block 402, Merlin oval heads, 10.2:1CR, TH400, 3.73 posi,
1/8th: 8.2 @ 86.8mph
1/4: 12.7 @ 107.8mph (1.93 sixty foot)
--have pulled a 1.85 sixty foot before (street tires or course).
Picture of me roasting the tires and other guy stuff (http://www.auburnextremeracing.com/drivers/mike/)
Video of me staging (smoke of course) (http://www.auburn.edu/~ledfojw/vids/mike_chevelle_burnout.avi)

Thanks guys, I know exactly what I need. I just needed a little jog of the ole memory.