How to replace heater core on 2005 Volkswagen Golf?

Golf

NOTE

Be sure to obtain the anti-theft code for the radio.

1. Disconnect the negative battery cable.
2. Drain the cooling system into a clean container for reuse.
3. Remove the driver-s side air bag by performing the following procedure:
   
   
   Release the steering column adjustment.

   Rotate the steering wheel until the spokes are vertical (90 degrees off center).

   Adjust the steering column to the completely out down position and lock the adjustment.

   At the rear of the steering wheel, insert a 7 in. (175mm) screwdriver into the hole in the hub approximately 1³₄

   Raise the screwdriver (as viewed from the driver-s seat) to release the air bag clip.

   Rotate the steering wheel 180 degrees in the opposite direction and release the clip on the other side.

   Center the steering wheel with the front wheels facing straight-ahead.

   Disconnect the electrical connector and remove the air bag.
4. Remove the steering wheel by performing the following procedure:
   
   
   Place the front wheels in the straight-ahead position.

   Remove the steering wheel-to-steering column bolt.

NOTE

The Multi-point socket head bolt can be used up to 5 times; be sure to place a punch mark on it each time it is reused.

Remove the steering wheel from the steering column.

1. Remove the center console-to-chassis bolts and the console.
2. Remove the instrument panel by performing the following procedure:
   
   
   Remove the upper steering column cover screws and the cover.

   Remove the 3 lower steering column cover screws, release the steering wheel height adjustment and remove the lower steering column switch trim.

   Remove the combination switch-to-steering column bolt, disconnect the electrical connectors and remove the combination switch.

   At the passenger-s side of instrument panel, remove the side cover.

   Remove the 7 glove box-to-instrument panel screws, disconnect the glove box light connector and remove the glove box.

   At the driver-s side, remove the both lower instrument panel cover screws and the covers.

   Remove the DLC-to-bracket screws.

   At the driver-s side, remove the 6 sound damper panel-to-instrument panel screws and the panel.

   Slide the Radio Release tool No. 3316 into the slots at both sides of the radio until they engage; then, pull the radio out of the instrument panel and disconnect the electrical connectors.

NOTE

To remove the Radio Release tool(s) No. 3316, press the locating tabs (located on both sides of the radio) inward and remove them.

At the center of the instrument pane (above the radio), unclip and remove the switches and disconnect the electrical connectors.

Unclip and remove the Climatronic control (heater control) trim.

Remove the 4 Climatronic control (heater control)-to-instrument panel screws and the control; then, disconnect the electrical connector.

Remove the 5 center reinforcement-to-chassis screws and the reinforcement.

At the driver-s side, remove the 3 footwell cover screws and the cover.

Remove the 2 instrument cluster-to-instrument panel screws, disconnect the multi-pin electrical connector and remove the instrument cluster.

At the upper center of the instrument panel, unclip the photo sensor and disconnect the electrical connector.

Rotate the light switch knob to0

Unclip the illumination control switch and disconnect the electrical connector.

Remove the instrument panel-to-chassis screws and the instrument panel from the crossmember.

1. Loosen the instrument panel crossmember-to-chassis bolts and lift the crossmember upward.
2. Disconnect the heater hoses from the heater core.
3. If not equipped with air conditioning, perform the following procedure:
   
   
   Partially remove the heater/ventilation housing assembly.

   Depress the retainer clips and remove the heater core from the heater housing.

NOTE

If the retainer clips break, use a self-tapping screw to hold the heater core in place.

1. If equipped with air conditioning, perform the following procedure:
   
   
   Discharge and recover the air conditioning system refrigerant.

   Disconnect the refrigerant lines from the evaporator core, discard the O-rings and plug the openings to prevent contamination.

   Remove the ventilation ducts from the heater/air conditioning housing assembly.

   Remove the heater core from the heater/air conditioning housing assembly.


Fig. Releasing the driver-s side air bag-Golf


Fig. Exploded view of the center console and related components-Golf


Fig. Exploded view of the instrument panel, crossmember and related components-Golf


Fig. Exploded view of the heater core, heater/ventilation housing and related components-Golf without air conditioning


Fig. Exploded view of the heater core, heater/air conditioning housing and related components-Golf with air conditioning

To install:

1. If equipped with air conditioning, perform the following procedure:
   
   
   Install the heater core to the heater/air conditioning housing assembly.

   Install the ventilation ducts to the heater/air conditioning housing assembly.

   Using new O-rings, connect the refrigerant lines to the evaporator core.
2. If not equipped with air conditioning, perform the following procedure:
   
   
   Install the heater core to the heater housing.

   Install the heater/ventilation housing assembly.
3. Connect the heater hoses to the heater core.
4. Tighten the instrument panel crossmember-to-chassis bolts.
5. Install the instrument panel by performing the following procedure:
   
   
   Install the instrument panel and the instrument panel-to-chassis screws.

   Connect the electrical connectors; then, install the light switch knob and the illumination control switch.

   At the upper center of the instrument panel, connect the electrical connector and install the photo sensor.

   Install the instrument cluster, connect the multi-pin electrical connector and install the 2 instrument cluster-to-instrument panel screws.

   At the driver-s side, install the footwell cover and the 3 cover screws.

   Install the center reinforcement and the 5 reinforcement-to-chassis screws.

   Connect the electrical connector; then, install the Climatronic control (heater control) and the 4 control-to-instrument panel screws.

   Install the Climatronic control (heater control) trim.

   At the center of the instrument pane (above the radio), Install the switches and connect the electrical connectors.

   Connect the electrical connectors and install the radio.

   At the driver-s side, install the sound damper panel and the 6 panel-to-instrument panel screws.

   Install the DLC-to-bracket screws.

   At the driver-s side, install the both lower instrument panel covers and the cover screws.

   Install the glove box, connect the glove box light connector and install the 7 glove box-to-instrument panel screws.

   At the passenger-s side of instrument panel, install the side cover.

   Install the combination switch, connect the electrical connectors and install the combination switch-to-steering column bolt.

   Install the lower steering column cover, the 3 lower steering column cover screws and the lower steering column switch trim.

   Install the upper steering column cover and the cover screws.
6. Install the center console and the console-to-chassis bolts.
7. Install the steering wheel and the steering wheel-to-steering column bolt. Torque the multi-point socket head bolt to 44 ft. lbs. (60 Nm).

NOTE

The Multi-point socket head bolt can be used up to 5 times; be sure to place a punch mark on it each time it is reused.

1. Connect the electrical connector and install the air bag.
2. Refill the cooling system.
3. Connect the negative battery cable.
4. Evacuate, charge and leak test the air conditioning system.
5. Operate the engine to normal operating temperatures; then, check the climate control operation and check for leaks.

NOTE

Be sure to obtain the anti-theft code for the radio.

1. Disconnect the negative battery cable.
2. Drain the cooling system into a clean container for reuse.
3. Remove the driver-s side air bag by performing the following procedure:
   
   
   Release the steering column adjustment.

   Rotate the steering wheel until the spokes are vertical (90 degrees off center).

   Adjust the steering column to the completely out down position and lock the adjustment.

   At the rear of the steering wheel, insert a 7 in. (175mm) screwdriver into the hole in the hub approximately 1 ³ / ₄ in. (45mm) deep.

   Raise the screwdriver (as viewed from the driver-s seat) to release the air bag clip.

   Rotate the steering wheel 180 degrees in the opposite direction and release the clip on the other side.

   Center the steering wheel with the front wheels facing straight-ahead.

   Disconnect the electrical connector and remove the air bag.
4. Remove the steering wheel by performing the following procedure:
   
   NOTE

   The Multi-point socket head bolt can be used up to 5 times; be sure to place a punch mark on it each time it is reused.
   
   
   
   
   Place the front wheels in the straight-ahead position.

   Remove the steering wheel-to-steering column bolt.
   
   
   
   
   Remove the steering wheel from the steering column.
5. Remove the center console-to-chassis bolts and the console.
6. Remove the instrument panel by performing the following procedure:
   
   NOTE

   To remove the Radio Release tool(s) No. 3316, press the locating tabs (located on both sides of the radio) inward and remove them.
   
   
   
   
   Remove the upper steering column cover screws and the cover.

   Remove the 3 lower steering column cover screws, release the steering wheel height adjustment and remove the lower steering column switch trim.

   Remove the combination switch-to-steering column bolt, disconnect the electrical connectors and remove the combination switch.

   At the passenger-s side of instrument panel, remove the side cover.

   Remove the 7 glove box-to-instrument panel screws, disconnect the glove box light connector and remove the glove box.

   At the driver-s side, remove the both lower instrument panel cover screws and the covers.

   Remove the DLC-to-bracket screws.

   At the driver-s side, remove the 6 sound damper panel-to-instrument panel screws and the panel.

   Slide the Radio Release tool No. 3316 into the slots at both sides of the radio until they engage; then, pull the radio out of the instrument panel and disconnect the electrical connectors.
   
   
   
   
   At the center of the instrument pane (above the radio), unclip and remove the switches and disconnect the electrical connectors.

   Unclip and remove the Climatronic control (heater control) trim.

   Remove the 4 Climatronic control (heater control)-to-instrument panel screws and the control; then, disconnect the electrical connector.

   Remove the 5 center reinforcement-to-chassis screws and the reinforcement.

   At the driver-s side, remove the 3 footwell cover screws and the cover.

   Remove the 2 instrument cluster-to-instrument panel screws, disconnect the multi-pin electrical connector and remove the instrument cluster.

   At the upper center of the instrument panel, unclip the photo sensor and disconnect the electrical connector.

   Rotate the light switch knob to 0 , press the knob inward, rotate it clockwise; then, pull the switch outward and disconnect the electrical connector.

   Unclip the illumination control switch and disconnect the electrical connector.

   Remove the instrument panel-to-chassis screws and the instrument panel from the crossmember.
7. Loosen the instrument panel crossmember-to-chassis bolts and lift the crossmember upward.
8. Disconnect the heater hoses from the heater core.
9. If not equipped with air conditioning, perform the following procedure:
   
   NOTE

   If the retainer clips break, use a self-tapping screw to hold the heater core in place.
   
   
   
   
   Partially remove the heater/ventilation housing assembly.

   Depress the retainer clips and remove the heater core from the heater housing.
10. If equipped with air conditioning, perform the following procedure:
    
    
    Discharge and recover the air conditioning system refrigerant.

    Disconnect the refrigerant lines from the evaporator core, discard the O-rings and plug the openings to prevent contamination.

    Remove the ventilation ducts from the heater/air conditioning housing assembly.

    Remove the heater core from the heater/air conditioning housing assembly.
    
    

    

    

    Fig. Releasing the driver-s side air bag-Golf

    
    
    

    

    

    Fig. Exploded view of the center console and related components-Golf

    
    
    

    

    

    Fig. Exploded view of the instrument panel, crossmember and related components-Golf

    
    
    

    

    

    Fig. Exploded view of the heater core, heater/ventilation housing and related components-Golf without air conditioning

    
    
    

    

    

    Fig. Exploded view of the heater core, heater/air conditioning housing and related components-Golf with air conditioning

To install:

1. If equipped with air conditioning, perform the following procedure:
   
   
   Install the heater core to the heater/air conditioning housing assembly.

   Install the ventilation ducts to the heater/air conditioning housing assembly.

   Using new O-rings, connect the refrigerant lines to the evaporator core.
2. If not equipped with air conditioning, perform the following procedure:
   
   
   Install the heater core to the heater housing.

   Install the heater/ventilation housing assembly.
3. Connect the heater hoses to the heater core.
4. Tighten the instrument panel crossmember-to-chassis bolts.
5. Install the instrument panel by performing the following procedure:
   
   
   Install the instrument panel and the instrument panel-to-chassis screws.

   Connect the electrical connectors; then, install the light switch knob and the illumination control switch.

   At the upper center of the instrument panel, connect the electrical connector and install the photo sensor.

   Install the instrument cluster, connect the multi-pin electrical connector and install the 2 instrument cluster-to-instrument panel screws.

   At the driver-s side, install the footwell cover and the 3 cover screws.

   Install the center reinforcement and the 5 reinforcement-to-chassis screws.

   Connect the electrical connector; then, install the Climatronic control (heater control) and the 4 control-to-instrument panel screws.

   Install the Climatronic control (heater control) trim.

   At the center of the instrument pane (above the radio), Install the switches and connect the electrical connectors.

   Connect the electrical connectors and install the radio.

   At the driver-s side, install the sound damper panel and the 6 panel-to-instrument panel screws.

   Install the DLC-to-bracket screws.

   At the driver-s side, install the both lower instrument panel covers and the cover screws.

   Install the glove box, connect the glove box light connector and install the 7 glove box-to-instrument panel screws.

   At the passenger-s side of instrument panel, install the side cover.

   Install the combination switch, connect the electrical connectors and install the combination switch-to-steering column bolt.

   Install the lower steering column cover, the 3 lower steering column cover screws and the lower steering column switch trim.

   Install the upper steering column cover and the cover screws.
6. Install the center console and the console-to-chassis bolts.
7. Install the steering wheel and the steering wheel-to-steering column bolt. Torque the multi-point socket head bolt to 44 ft. lbs. (60 Nm).
   
   NOTE

   The Multi-point socket head bolt can be used up to 5 times; be sure to place a punch mark on it each time it is reused.
8. Connect the electrical connector and install the air bag.
9. Refill the cooling system.
10. Connect the negative battery cable.
11. Evacuate, charge and leak test the air conditioning system.
12. Operate the engine to normal operating temperatures; then, check the climate control operation and check for leaks.

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Also see this link below for more details:---

How to replace heater core on Volkswagen Model?

http://vwrepairhelp.blogspot.com/2011/11/how-to-replace-heater-core-on.html

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http://vwrepairhelp.blogspot.com/2011/11/how-to-replace-heater-core-on-2005.html

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http://vwrepairhelp.blogspot.com/2011/11/how-to-replace-heater-core-on-2005_10.html

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