Heater System: Overview Hyundai Veloster I

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1. Disconnect the negative (-) battery terminal.
2. Recover the refrigerant with a recovery/recycling/charging station.
3. When the engine is cool, drain the engine coolant from the radiator.
4. Remove the expansion valve (A) from the evaporator core and then remove the cover (B). Tightening torque: 7.8 ~ 11.7 N.m (0.8 ~ 1.2 kgf.m, 5.7 ~ 8.6 lb-ft) CAUTION: Plug or cap the lines immediately after disconnecting them to avoid moisture and dust contamination.
5. Disconnect the inlet (A) and outlet (B) heater hoses from the heater unit and then remove the cover (C). 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 center console. (Refer to «CONSOLE»(ref-609328-S41528823382014041600000) )
7. Remove the steering handle and column. (Refer to «STEERING COLUMN AND SHAFT»(ref-609297-S07257609932014041600000) )
8. Remove the cowl top cover. (Refer to «COWL TOP COVER»(ref-609325-S18942571122014041600000) )
9. Remove the photo sensor. (Refer to «MAIN CRASH PAD REPLACEMENT»(ref-609328-S34514369772014041600000) )
10. Loosen the cowl cross member mounting bolts (A).
11. Remove the left & right front filler trim and than disconnect the connectors (A).
12. Disconnect the left & right multi box connectors (A).
13. Disconnect the main fuse box connectors (A).
14. Disconnect the air bag connectors (A).
15. Remove the center fascia panel (A).
16. Loosen the heater & blower unit mounting bolt (A).
17. Loosen the heater & blower unit mounting bolts (A).
18. Loosen the cowl cross member mounting bolts (A) and then remove the crash pad and heater & blower unit assembly (B).
19. Disconnect the connectors and then remove the heater & blower unit (A) from the crash pad.
20. Remove the blower unit (A) from heater unit after loosening screws.
21. Loosen the mounting screws and then remove the heater core cover (A).
22. Disconnect the heater core (A) from heater unit.
23. Loosen the heater unit lower case mount screws and then remove the heater unit lower case (A).
24. Remove the evaporator core (A). CAUTION: Be careful that the inlet and outlet pipe are not bent during heater core removal, and pull out the heater core.
25. Installation is the reverse order of removal. NOTE: If you're installing a new evaporator, add refrigerant oil (PAG OIL). 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. Immediately after using the oil, replace the cap on the container, and seal it to avoid moisture absorption. 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 Apply sealant to the grommets. Make sure that there is no air leakage. Charge the system and test its performance. Do not interchange the inlet and outlet heater hoses and install the hose clamps securely. Refill the cooling system with engine coolant

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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

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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.
4. Check the voltage between terminals 6 and 7. VOLTAGE 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.

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.

Scheme 24

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.
5. Check the voltage between terminals 6 and 5. Door position Voltage (6-5) Error detecting Vent 0.45 ± 0.15V Low voltage: 0.1V or less Bi-Level 1.4 ± 0.15V Floor 2.45 ± 0.15V Mix 3.5 ± 0.15V Defrost 4.55 ± 0.15V High voltage: 4.9V or more It will feedback current position of actuator to controls.
6. If the measured voltage is not specification, substitute with a known-good mode control actuator and check for proper operation.
7. If the problem is corrected, replace the mode control actuator.

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1. Disconnect the negative (-) battery terminal.
2. Remove the side cover (A).
3. Remove the fuse box cover (A) and loosen the mounting screws and then remove the crash pad lower cover (B).
4. Disconnect the diagnosis connector (A).
5. Remove the shower duct (A).
6. Disconnect the temperature control actuator connector (A) and loosen the mounting screws and then remove the temperature control actuator (B).
7. Installation is the reverse order of removal.