AC/Heating Vacuum Diagram

**Egreen** · 01-11-2005, 03:05 AM

Hello, Im searching for a AC/heat Vacuum Diagram for my 66 Buick Special, does anyone know of an internet site where I could find this information. I replaced my 300 with a 350 and I can't seem to get my heater working. I have switched the control valve but the vacuum hoses have me puzzled. I can switch from Def/heater but no heat from the fan..

If not a website maybe a good ref manual I can buy that might help me out. Thanks

**Ted Nagel** · 01-11-2005, 10:01 AM

Just a thought -dad was working on his heater and could tell the water was not getting past the brand new valve.
anyway, there are 2 kinds of valves. one is vacuum present =valve closed, other is vacuum present valve open. It was the wrong one in there so a 5 minute trip to autopartsRus and it was fixed. Just throwing my .02 around!

YellowLark · 01-11-2005, 12:15 PM

All those diagrams are in the 1966 Buick Chassis Service Manual. These can be usually be found on eBay. The material is still copyrighted, so you won't find it on the internet.

**Egreen** · 01-11-2005, 04:24 PM

Hey thanks ! I'll check that valve again because I did go from "no vacuum" to "vacuum" on that control valve. If all fails I'll grap a service manuall off the net.

Thanks Guys

RUSTY.S · 01-21-2005, 06:30 PM

Our 68'lesabre 400 will not blow hot air,and the vaccumes are all unhooked,the hose that goes from the water pump to the heater core is not getting hot.we havn't messed with the vacumes none.