Housing Assembly HVAC: Testing and Inspection

AIR CONDITIONING: AIR CONDITIONING UNIT:

INSPECTION

1. INSPECT AIR MIX DAMPER SERVO (AIR MIX DAMPER SERVO SUB-ASSEMBLY)(MANUAL AIR CONDITIONING)

HINT: The air mix control servomotor (air mix damper servo sub-assembly) can be removed following the disassembly procedure for air conditioning radiator assembly (Disassembly).





(a) Inspect servomotor operation.
(1) Connect the positive (+) lead from the battery to terminal 4 and negative (-) lead to terminal 5, then check that the arm turns to the "MAX. COOL" side smoothly.
(2) Connect the positive (+) lead from the battery to terminal 5 and negative (-) lead to terminal 4, then check that the arm turns to the "MAX. HOT" side smoothly.
If operations are not as specified, replace the air mix servomotor.
(b) Inspect position sensor resistance.









(1) Measure the resistance between terminals at each servomotor arm position as shown in the chart.
Standard resistance:





If the resistance is not as specified, replace the servomotor.
2. INSPECT AIR OUTLET CONTROL SERVOMOTOR (MODE DAMPER SERVO SUB-ASSEMBLY)(MANUAL AIR CONDITIONING)

HINT: The air outlet control servomotor (mode damper servo sub-assembly) can be removed following the disassembly procedure for air conditioning radiator assembly (Disassembly).





(a) Inspect servomotor operation.
(1) Connect the positive (+) lead from the battery to terminal 7 and the negative (-) lead to terminal 8.
(2) Connect the negative (-) lead from the battery to each terminal as shown in the chart, and check that the shaft rotates to each position, as shown in the illustration.





If operation is not as specified, replace the servomotor.
3. INSPECT A/C EVAPORATOR TEMPERATURE SENSOR (COOLER THERMISTOR NO.1)(MANUAL AIR CONDITIONING)

HINT: The A/C evaporator temperature sensor (cooler thermistor No.1) can be removed following the disassembly procedure for the air conditioning radiator assembly (Disassembly).





(a) Remove the A/C evaporator temperature sensor (cooler thermistor No.1).
(b) Measure the resistance according to the value(s) in the table below.





Standard resistance:





NOTICE:
- Even slightly touching the sensor may change the resistance value. Be sure to hold the connector of the sensor.
- When measure the sensor temperature must be the same as the ambient temperature.

HINT: As the temperature increases, the resistance decrease (see the graph).

If the resistance value is not as specified, replace the A/C evaporator temperature sensor (cooler thermistor No.1).
If the resistance value is not as specified, replace the A/C evaporator temperature sensor (coolant thermistor No.1).