Heater System: Overview Kia Carnival III

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1. Disconnect the negative (-) battery terminal.
2. Recover the refrigerant with a recovery/recycling/charging station. Refer to «REFRIGERANT RECOVERY»(ref-674580-S40358541252014120300000) .
3. When the engine is cool, drain the engine coolant from the radiator.
4. Remove the bolts (A) and the expansion valve (B) from the evaporator core. Plug or cap the lines immediately after disconnecting them to avoid moisture and dust contamination.
5. Disconnect the inlet (C) and outlet (D) heater hoses from the heater unit. CAUTION: Engine coolant will run out when the hoses are disconnected; drain it into a clean drip pan. Be sure not to let coolant spill on electrical parts or painted surfaces. If any coolant spills, rinse it off immediately.
6. Remove the crash pad. Refer to CRASH PAD .
7. Remove the cowl cross bar assembly. Refer to COWL CROSS BAR ASSEMBLY REPLACEMENT .
8. Disconnect the connectors from the temperature control actuator, the mode control actuator and the evaporator temperature sensor.
9. Remove the heater & blower unit after loosening 3 mounting bolts.
10. Remove the blower unit (B) from heater unit after loosening 2 screws.
11. Remove the heater core (B) after remove the cover (A).
12. Loosen the heater unit mounting screw and clip and then remove the heater unit cover (A).
13. Remove the evaporator core (A).
14. Be careful that the inlet and outlet pipe are not bent during heater core removal, and pull out the heater core.
15. Installation is the reverse order of removal, and note these items

1. If you're installing a new evaporator, add refrigerant oil (ND-OIL8).
2. Replace the O-rings with new ones at each fitting, and apply a thin coat of refrigerant oil before installing them. Be sure to use the right O-rings for R-134a to avoid leakage.
3. Immediately after using the oil, replace the cap on the container, and seal it to avoid moisture absorption.
4. Do not spill the refrigerant oil on the vehicle; it may damage the paint; if the refrigerant oil contacts the paint, wash it off immediately.
5. Apply sealant to the grommets.
6. Make sure that there is no air leakage.
7. Charge the system and test its performance.
8. Do not interchange the inlet and outlet heater hoses and install the hose clamps securely.
9. Refill the cooling system with engine coolant.

Description

1. Heater unit includes mode control actuator and temperature control actuator.
2. 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.

Scheme 11

The mode control actuator is located at the heater unit.

It adjusts position of mode door by operating mode control actuator based on signal of A/C control unit. Pressing mode select switch makes the mode control actuator shift in order of vent--> B/L --> floor --> mix.

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1. Ignition "OFF"
2. Disconnect the connector of mode control actuator.
3. Verify that the mode control actuator operates to the defrost mode when connecting 12V to the terminal 3 and grounding terminal 4.
4. Verify that the mode control actuator operates to the vent mode when connecting in the reverse. PASSENGER
5. Check the voltage between terminals 6 and 7.

VOLTAGE SPECIFICATION

DRIVER

Scheme 14

VOLTAGE SPECIFICATION

It will feedback current position of actuator to controls.

1. If the measured voltage is not specification, substitute with a known-good mode control actuator and check for proper operation.
2. If the problem is corrected, replace the mode control actuator.