The mode control knob on the a/c heater control panel is used to direct the conditioned air to the selected system outlets. On manual temperature control systems, the mode control knob switches engine vacuum to control the mode doors, which are operated by vacuum actuators. On AZC systems, the mode control knob switches electrical current to control the mode doors, which are operated by electronic actuators need to check for codes
vacuum supply line is connected at the engine intake manifold for the manual temperature control system.
Wednesday, November 25th, 2009 AT 5:58 AM