Anyone have a problem with the heater not working. Air works. Will look at the heater control valve and vacuum pressure to it. I believe the only place I'm able to purchase a heater control valve was Corvette Central $70). Anyone know of another place?

Old question but really need to try replacing the vacuume control part under the control levers. These are just 2 pieces of plastic with a maze patteren inside and the 2 plastic pieces rubbing together just wears out the control logic to the tiny hoses. About $12.00 to replace. Should get a new one anyway they are so old. Bust open an old one and you will be amazed. Price first , cheap.

Forgot to include that cleaning out the 5 small vacuume hoses is also a good idea , interior dust plugs these up and very hard to clean. I found that using the smallest guitar string wire that still has a winding around it works great to hold it's shape and to fold over at all to scrape out all the sticky dust for ya.

Thanks, I'll take a look at that as soon as I can.