You can find a 1969 Grand Prix vacuum diagram at most General Motors dealerships. You can also find the diagram in most 1969 Grand Prix service manuals at your local library.
need vacuum hose diagram fast idle ac
You can find a 1987 Ford E1 50 vacuum operated heater control diagram at your local Ford dealership. Most local libraries will have Ford service manuals with the diagram.
Diagram for vacum line / heater lines for 1983 nissan 280z
The heater control valve is used to shut off hot coolant from entering the core when the heater is in the off position. A heater control valve can be actuated by either a vacuum line or a cable from the vacuum heater control valve to the heater core. This hose should be warm; if not the heater control valve is stuck and needs to be replaced
Phew and Wow, there are many vacuum diagrams-heater/air control,brake booster,rear driveline etc.Can you be more specific and include engine size.
vacume line to the valve has broke off from manifold vac that goes to the switch
Its a Heater & A/C Control Vacuum Control Solenoid Valve
Go to the dealer and ask them to photocopy the page for you. Keep in mind though, that half of that system is vacuum contoled. You may need the vacuum diagram as well.
if im not mistaken the heater control has vacuum lines. take off heater controls and see if you have a bad vacuum line to heater box.
Some systems use engine vacuum to move the control doors. You could have a vacuum leak.
There is no heater control valve on this generation of dodges like there used to be... the water flows constantly through the heater valve.. the only control is a trap door that allows cab air to be run through the heater core and is controlled by a vacuum solenoid in the heater box.. the temp control is also vacuum operated but be sure to check the vacuum supply line coming in from the engine.... it has a check valve in it that can be keeping the controls from getting enough vacuum to operate properly.. if you don't have a mighty vac just get one of those packs of barbed vacuum fittings from your local shucks and bypass the valve temporarily and see if you get heat... hope this helps