AC/Heater Vacuum Diagram for 1999 chevy express 1500 van 6 cyl.
Okay, there's 3 switches on dashboard, 1st one is for blower speed which blower motor & resistor are working Fine, 2nd one is for switching the temperature which operates a Electric Actuator blend door and its working Fine, 3rd one is for switching the air flow to either defrost, down to feet, vents at chest level, or a mixture of these three and also ac & max ac, the 3rd one is not operating the air flow it is stuck blowing at the feet and defrost, this switch operates a Vacuum Actuator which operates a door to direct the flow, I pulled the hose off this actuator & Im not getting any vacuum here so Im assuming something is plugged or broken somewhere. Im trying to find a vacuum diagram so I can back trace & find the leak, any help would be appreciated, Thanks Glenn D.