More pic for my questions

[70 c10 rook]

For some reason it will only do one pic for me. Here's the switch I needed help with

[71CHEVYSHORTBED402]

Believe that's called a A/C Compressor Clutch Switch.....You might locate the vendor board, I'm sure they can provide all the parts you need. Hope so....The heater/evaporator boxes are next in line for my removal. BTW, if your A/C diverter box is old, you might check the flapper. Dollars to donuts it's bad.

[70 c10 rook]

I have the whole tore down and the flappers look good,they move easily,how would I know if they are bad, and thanks for your reply

[71CHEVYSHORTBED402]

I can't speak for the heater box, don't even know if there's a flapper, but I'm guessing not.

The flapper for the Air/Defroster Selector Duct (under temp. control) is probably a bit worn on the end. Mine is, but it's still good. These are a pretty tough piece of rubber.

As for the flapper for the Duct Air Selector (aka A/C diverter box), inspect for tears around the hinge. Also, see what it does when you flip the link back and forth. If it doesn't open and close correctly then the flapper is torn up. From what I've seen, I'll be surprised if you have the original box with a good flapper. You can buy a replacement or a brand new GM. I know Classic Heartbeat has the GM.