More pic for my questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**71CHEVYSHORTBED402** · 01-06-2016, 01:12 AM

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.

01-06-2016, 01:12 AM	#4
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,187	Re: More pic for my questions 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. __________________ Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025



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