Temperature Valves

There are two temperature valves, driver (LH) and passenger (RH). Each temperature valve is controlled by a corresponding electric actuator, LH or RH respectively. The temperature valve electric actuators move the associated temperature valve to the desired positions which in turn produce the proper temperature of the air delivered to each side (LH and RH) of the passenger compartment. The electric actuators are controlled by the temperature control knobs on the HVAC control head. The LH temperature control knob is the primary control for both of the electric actuators. When the MODE button on the HVAC control head is depressed, the LH temperature control knob will operate both of the electric actuators to obtain the same temperature to both the LH and RH sides of the passenger compartment. When the AUTO button is depressed, the RH temperature control knob will control the RH electric actuator to provide a different temperature (if desired) to the RH side of the passenger compartment, unless the LH temperature control knob is set to the maximum cold or the maximum hot setting. If the LH temperature control knob is set to the maximum cold or the maximum hot setting, the LH temperature control knob will control both the LH and RH electric actuators. When the LH temperature control knob is in any other position, the RH temperature control knob may be used to control the RH electric actuator. When the LH temperature control knob is in the full cold position, the actuators position the temperature valves such that the air flow will by-pass the heater core. With the knob in any other position but full cold, the actuators position the temperature valves to allow air to pass through the heater core. The hotter the control knob setting, the more air passes through the heater core, increasing the air temperature entering the passenger compartment.