Manual A/c-Heater Systems - HVAC: Application Mazda Tribute I

Function Selector Switch Vacuum Application Chart

Note. A leak in the vacuum control circuits will send all airflow to the defroster outlets. This condition may occur during acceleration indicating a slow leak, exist at all times indicating a large leak, or it may exist only when specific functions are selected indicating a leak in that portion of the circuit.

Scheme 180

The manual climate control system heats or cools the vehicle interior depending on the position of the function selector switch and the temperature selected. The position of the function selector switch determines heating or cooling and air distribution. The temperature control setting determines air temperature.

The manual climate control system components include

1. blower motor switch resistor
2. vacuum degas bottle tank
3. climate control assembly
4. blower motor relay
5. A/C compressor clutch relay
6. footwell vent vacuum control motor
7. defrost vacuum control motor
8. panel vent vacuum control motor
9. outside air inlet vacuum control motor
10. temperature blend door control cable

Scheme 181

The climate control assembly has three system controls

1. The A/C heater function selector switch combines a vacuum selector valve with two electrical switches to supply battery positive voltage (B+) to the A/C clutch circuit and the blower motor control circuit.
2. The temperature selection is accomplished through cable-controlled positioning of the temperature blend door located in the heater core housing.
3. The blower motor switch controls the blower motor speed by adding or bypassing resistors in the heater blower motor switch resistor.

Scheme 182

The four-speed operation of the blower motor is achieved through the blower motor switch resistor and contains a thermal limiter which is used as a temperature protecting fuse. The assembly is located on the passenger-side on the evaporator core housing behind the glove compartment.