HowToRepairGuide.com: Honda Heater Core Replacement?

The Heater Core Replacing procedure.

Removal & Installation

Make sure you have the anti-theft codes for the radio and the navigation system, then write down the XM radio channel presets.

Make sure the ignition is OFF, then disconnect the negative cable from the battery. Wait at least 3 minutes before proceeding.

Recover the refrigerant with a recovery/recycling/charging station.

Remove the intake manifold cover.

Remove the bolts and nut, then disconnect the suction line (A) and the receiver line (B) from the evaporator core.

Fig. Remove the bolts and nut, then disconnect the suction line (A) and the receiver line (B) from the evaporator core

From under the hood, open the cable clamp (A), then disconnect the heater valve cable (B) from the heater valve arm (C). Turn the heater valve arm to the fully opened position as shown.

Fig. From under the hood, open the cable clamp (A), then disconnect the heater valve cable (B) from the heater valve arm (C). Turn the heater valve arm to the fully opened position as shown

When the engine is cool, drain the engine coolant from the radiator.

Fig. Drain the engine coolant from the radiator

Slide the hose clamps (A) back. Remove the nut and the water valve (B), then disconnect the inlet heater hose (C) and the outlet heater hose (D) from the heater unit. 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 the electrical parts or the painted surfaces. If any coolant spills, rinse it off immediately.

Fig. Slide the hose clamps (A) back. Remove the nut and the water valve (B), then disconnect the inlet heater hose (C) and the outlet heater hose (D) from the heater unit

Remove the mounting nut from the heater unit. Take care not to damage or bend the fuel lines and the brake lines, etc.

Fig. Remove the mounting nut from the heater unit

From under the dash, remove the clip (A) and detach the clip (B), release the hook (C) and stud (D), then remove the driver's heater lower cover (E) and passenger's heater lower cover (F).

Fig. From under the dash, remove the clip (A) and detach the clip (B), release the hook (C) and stud (D), then remove the driver's heater lower cover (E) and passenger's heater lower cover (F)-2005-06 models

Open the beverage holder (A), and remove the screws.

Fig. Open the beverage holder (A), and remove the screws

Remove the dashboard center lower cover (A).
1. Pull out the cover to release the clips (B, C).
2. Disconnect the seat heater connectors (D) and accessory socket connectors (E).
  
  Fig. Remove the dashboard center lower cover (A). Pull out the cover to release the clips (B, C). Disconnect the seat heater connectors (D) and accessory socket connectors (E)

Remove the screws, then remove the driver's A/C duct (A) from the dashboard (B).

Fig. Remove the screws, then remove the driver's A/C duct (A) from the dashboard (B)

Remove the screws, then remove the passenger's A/C duct (A) from the dashboard (B).

Fig. Remove the screws, then remove the passenger's A/C duct (A) from the dashboard (B)

Remove the screws, then remove the center A/C duct from the dashboard.

Remove the screws, then remove the defogger duct (A) from the dashboard (B).

Fig. Remove the screws, then remove the defogger duct (A) from the dashboard (B)

Disconnect the connectors (A) from the blower motor and the power transistor, then remove the wire harness clips (B).

Fig. Disconnect the connectors (A) from the blower motor and the power transistor, then remove the wire harness clips (B)

Disconnect the connectors (A) from the mode control motor and the recirculation control motor, then remove the wire harness clips (B) and the connector clip (C).

Fig. Disconnect the connectors (A) from the mode control motor and the recirculation control motor, then remove the wire harness clips (B) and the connector clip (C)

Disconnect the connectors from the evaporator sensor and the air mix control motor, then remove the wire harness clips and the wire harness.

Remove the drain hose (A), then remove the nuts and the blower-heater unit (B).

Fig. Remove the drain hose (A), then remove the nuts and the blower-heater unit (B)

Remove the self-tapping screws, the joint duct (A), and seal (B). Remove the self-tapping screws, then remove the passenger's heater outlet (C), and the heater core cover (D). Remove the self-tapping screws, the heater pipe brackets (E), the grommets (F), and carefully pull out the heater core (G) so you don't bend the inlet and outlet pipes.

Fig. Remove the self-tapping screws, the joint duct (A), and seal (B). Remove the self-tapping screws, then remove the passenger's heater outlet (C), and the heater core cover (D). Remove the self-tapping screws, the heater pipe brackets (E), the grommets (F), and carefully pull out the heater core (G)

To install:

Install the heater core in the reverse order of removal.

Install the heater unit in the reverse order of removal, and note these items:

Do not interchange the inlet and outlet heater hoses, and install the hose clamps securely.
Refill the cooling system with engine coolant.
Make sure that there is no coolant leakage.
Make sure that there is no air leakage.
If you're installing a new evaporator core, add refrigerant oil (DENSO® ND-OIL 8).
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 correct O-rings for HFC-134a (R-134a) to avoid leakage.
Immediately after using the oil, reinstall 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.
Make sure that there is no air leakage.
Charge the system.

Adjust the heater valve cable.
1. Set the temperature control dial to Max Cool (Lo) with the ignition switch ON (II).
2. Attach the heater valve cable (B) to the air mix control linkage (C) as shown. Hold the end of the heater valve cable housing against the stop (D), then snap the heater valve cable housing into the cable clamp (A).
  
  NOTE
  Make sure the ring-end of the cable is pushed all the way to the base of the pin on air mix control linkage.
  
  Fig. Attach the heater valve cable (B) to the air mix control linkage (C) as shown. Hold the end of the heater valve cable housing against the stop (D), then snap the heater valve cable housing into the cable clamp (A)-2005-06 models
3. From under the hood, turn the heater valve arm (C) to the fully closed position as shown, and hold it. Attach the heater valve cable (B) to the heater valve arm, and gently pull on the heater valve cable housing to take up any slack, then install the heater valve cable housing into the cable clamp (A).
  
  Fig. From under the hood, turn the heater valve arm (C) to the fully closed position as shown, and hold it. Attach the heater valve cable (B) to the heater valve arm, and gently pull on the heater valve cable housing to take up any slack, then install the heater valve cable housing into the cable clamp (A)-2005-06 models

Reset the power window control unit:
1. Using the HDS:
  
  Connect the HDS to the vehicle's DLC.
  Turn the ignition switch ON (II), then enter the vehicle's VIN and mileage at the prompts.
  Select ''BODY ELECTRICAL'' from the ''System Selection'' menu.
  From the ''BODY ELECTRICAL SYSTEM SELECT'' menu, select ''Power Windows''.
  From the ''MODE'' menu, select ''Adjustments''.
  From the ''ADJUSTMENT'' menu, select ''WINDOW P RESET'' for driver's side window.
  Follow the prompts on the screen.
  Confirm that the power window control unit is reset by using the driver's window AUTO UP and AUTO DOWN function.
2. Without the HDS:
  
  NOTE
  The next 4 steps must be done within 5 seconds of each other.
  
  Turn the ignition switch ON (II).
  Move the driver's window all the way down by using the driver's window DOWN switch.
  Open the driver's door.
  
  Turn the ignition switch OFF.
  Push and hold the driver's window DOWN switch.
  Turn the ignition switch ON (II).
  Release the driver's window DOWN switch.
  Repeat these 4 steps three more times.
  Wait 1 second.
  Confirm that AUTO UP and AUTO DOWN do not work. If AUTO UP and DOWN work, go back to the first step.
  Move the driver's window all the way down by using the driver's window DOWN switch.
  Pull up and hold the driver's window UP switch until the window reaches the fully closed position, then continue to hold the switch for 1 second.
  Confirm that the power window control unit is reset by using the driver's window AUTO UP and AUTO DOWN function.
  If the window still does not work in AUTO, repeat the procedure several times, paying close attention to the 5 second time limit between steps.

Enter the anti-theft codes for the radio and the navigation system, then enter the XM radio channel presets.

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This details will help you.

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