Heating,Ventilation, Air Conditioning > Heater > Temperature Control Actuator >
Description and Operation
Description
Temperature control actuator is located at the heater unit. It regulates the temperature by the procedure as follows. Signal
from control unit adjusts position of temperature door by operating temperature switch and then temperature will be
regulated by the hot/cold air ratio decided by position of temperature door
Heating,Ventilation, Air Conditioning > Heater > Temperature Control Actuator > Repair
procedures
Inspection
1. Ignition "OFF"
2. Disconnect the connector of temperature control actuator.
3. Verify that the temperature control actuator operates to the hot position when connecting 12V to the terminal 4 and
grounding terminal 3
Verify that the temperature control actuator operates to the cool position when connecting in the reverse.
1. -
2. -
3. Cool position
4. Hot position
5. Sensor (+5V)
6. Feedback signal
7. Sensor ground
4. Check the voltage between terminals 6 and 7.
Specification
Door position
Voltage (6-7)
Error detecting
Max. cooling
0.45 ± 0.15V
Low voltage : 0.1V or less
Max. heating
4.55 ± 0.15V
High voltage : 4.9V or more
It will feedback current position of actuator to controls.
5. If the measured voltage is not specification, substitute with a known-good temperature control actuator and check for
proper operation.
6. If the problem is corrected, replace the temperature control actuator.
Replacement
1. Disconnect the negative (-) battery terminal.
2. Remove the heater & blower unit.
(Refer to HA group - "Heater Unit")
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3/12/2012 8:27 PM