Honda_Odyssey_2001-2006

Heater Core

Print

Removal & Installation



2001-04 Models


Click image to see an enlarged view

Fig. A. Clamp B. Evaporator lines C. Expansion valve D. Clamp E. Heater core F. Rear mode control motor G. Lower housing H. Right housing I. Left housing J. Evaporator core K. Capillary tube L. Electrical tape Rear HVAC unit-2001-04 models

  1. When the engine is cool, drain the engine coolant from the radiator.
  2.  
  3. Recover the refrigerant with a recovery/recycling/charging station.
    NOTE
    Put on gloves to protect your hands. When prying with a flat-tip screwdriver, wrap it with protective tape to prevent damage. Take care not to bend or scratch the trim and panels.

  4.  
  5. Remove the trim as shown.

    Click image to see an enlarged view

    Fig. Rear trim panel removal-2001-04 models



    To remove the rear side trim panel, remove the speaker grille and rear speaker.
     
    When removing the side trim panels, be sure to remove the mounting screws behind the rear speakers.
     
    Be sure to disconnect the rear accessory socket and brake light failure sensor connectors when removing the left rear trim panel.
     

  6.  
  7. Disconnect the connectors (A) from the rear blower motor and the rear blower resistor, then remove the self-tapping screws, the mounting bolts and the rear blower unit (B).

    Click image to see an enlarged view

    Fig. Rear blower motor removal-2001-04 models

  8.  
  9. Remove the clips (A) and the rear heater duct (B).

    Click image to see an enlarged view

    Fig. Rear heater duct removal-2001-04 models

  10.  
  11. Remove the bolt from the bracket (A). Disconnect the suction line (B) and receiver line (C) from the rear evaporator. Slide the hose clamps (D) back, then disconnect the inlet heater hose (E) and the outlet heater hose (F) from the rear 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. Plug or cap the lines immediately after disconnecting them to avoid moisture and dust contamination.

    Click image to see an enlarged view

    Fig. Remove the bolt from the bracket (A). Disconnect the suction line (B) and receiver line (C) from the rear evaporator. Slide the hose clamps (D) back, then disconnect the inlet heater hose (E) and the outlet heater hose (F) from the rear heater unit-2001-04 models

  12.  
  13. Remove the clip (A), then lifting the upper duct (B) up. Disconnect the connector (C) from the rear mode control motor. Remove the mounting bolts and the rear evaporator-heater unit (D).

    Click image to see an enlarged view

    Fig. Remove the clip (A), then lifting the upper duct (B) up. Disconnect the connector (C) from the rear mode control motor. Remove the mounting bolts and the rear evaporator-heater unit (D)-2001-04 models

  14.  
  15. Remove the self-tapping screws and the clamp, then remove the bolts and the evaporator lines together with the expansion valve. If necessary, remove the expansion valve. Use a second wrench to hold the other fitting on the valve so the evaporator lines won't twist. Leave the first fitting loosely connected so you can use it to hold the valve while you loosen the second fitting.
  16.  
  17. Remove the self-tapping screws and the clamp, then be careful not to bend the inlet and outlet pipes during the heater core removal, and pull out the heater core.
  18.  
  19. Install the unit in the reverse order of removal, and note these items.

    If you're installing a new evaporator, 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.
     
    Do not interchange the inlet and outlet heater hoses. 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.
     
    Charge the system.
     

  20.  

2005-06 Models


Click image to see an enlarged view

Fig. A. Rear in-car temperature sensor B. Rear power transistor C. Rear air mix control motor D. Rear mode control motor E. Rear blower motor F. Rear climate control unit G. Clamps H. Rear heater core I. Clamp J. Evaporator lines K. Expansion valve L. Right housing M. Left housing N. Insulator O. Evaporator core P. Capillary tube Q. Electrical tape Rear HVAC unit components-2005-06 models

  1. Recover the refrigerant with a recovery/recycling/charging station.
  2.  
  3. Remove these items:

    Sliding door sill trim, as needed
     
    C-pillar trim
     
    Sliding door opening trim, as needed
     

  4.  
  5. Pull the lower anchor cover (A) back, and remove the lower anchor bolt (B).

    Click image to see an enlarged view

    Fig. Pull the lower anchor cover (A) back, and remove the lower anchor bolt (B)-2005-06 models

  6.  
  7. Detach the clip and release the hooks (A) then remove the pivot cover (B).

    Click image to see an enlarged view

    Fig. Detach the clip and release the hooks (A) then remove the pivot cover (B)-2005-06 models

  8.  
  9. Remove the lower anchor bolt (A).

    Click image to see an enlarged view

    Fig. Remove the lower anchor bolt (A)-2005-06 models

  10.  
  11. Remove the rear side trim panel (A).
  12.  
  13. Remove the cap (B) by releasing the two hooks (C).
  14.  
  15. Remove the rear side bolt (D).
  16.  
  17. Pull out the rear upper edge of the trim panel by hand to release the hooks (E) from the D-pillar trim (F).
  18.  
  19. Pull the trim panel back by hand to detach the clips (G, H).
  20.  
  21. Disconnect the accessory socket connectors (I) and the rear entertainment system auxiliary jack connector (J).

    Click image to see an enlarged view

    Fig. A. Rear side trim panel B. Cap C. Hooks D. Rear side bolt E. Hooks F. D-pillar trim G. Clips H. Clips I. Accessory socket connectors J. Rear entertainment system auxiliary jack connector Rear trim panel removal-2005-06 models

  22.  
  23. Remove the rear side trim panel beverage holder (A).
  24.  
  25. Detach the clips and release the hooks (B), then remove the rear speaker grille (C).
  26.  
  27. Remove the screws.
  28.  
  29. Slide the beverage holder forward to release the rear hooks (D).

    Click image to see an enlarged view

    Fig. A. Beverage holder B. Hooks C. Rear speaker grille D. Hooks Beverage holder removal-2005-06 models

  30.  
  31. Remove the wire harness clip (A), the clip (B) and remove the side duct (C).

    Click image to see an enlarged view

    Fig. Remove the wire harness clip (A), the clip (B) and remove the side duct (C)-2005-06 models

  32.  
  33. Remove the bolts, then hang the rear junction box (A) down.

    Click image to see an enlarged view

    Fig. Rear junction box-2005-06 models

  34.  
  35. Disconnect the rear evaporator receiver line (A) and the suction line (B) connections. Slide the hose clamps (C) back, then disconnect the inlet heater hose (D) and the outlet heater hose (E) from the rear heater core. 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, the carpet, or the painted surfaces. If any coolant spills, rinse it off immediately.

    Click image to see an enlarged view

    Fig. Disconnect the rear evaporator receiver line (A) and the suction line (B) connections. Slide the hose clamps (C) back, then disconnect the inlet heater hose (D) and the outlet heater hose (E) from the rear heater core-2005-06 models

  36.  
  37. Disconnect the connectors from the rear mode control motor, the rear blower motor, rear in-car temperature sensor and rear climate control unit, then remove the wire harness clips, from the rear HVAC unit.
  38.  
  39. Remove the bolts, then pull out the rear HVAC unit (A). Disconnect the rear air mix control motor connector (B), then remove the rear HVAC unit.

    Click image to see an enlarged view

    Fig. Remove the bolts, then pull out the rear HVAC unit (A). Disconnect the rear air mix control motor connector (B), then remove the rear HVAC unit-2005-06 models

  40.  
  41. Remove the self-tapping screws, the clamps and the rear heater core.
  42.  
  43. Installation is the reverse of removal.

    Make sure no air is leaking from the right housing, the left housing and the lower housing fitting.
     
    Before reassembly, make sure that the rear air mix control linkage and door move smoothly without binding.
     
    Before reassembly, make sure that the rear mode control linkage and door move smoothly without binding.
     
    After reassembly, make sure the rear air mix control motor runs smoothly.
     
    After reassembly, make sure the rear mode control motor runs smoothly.
     
    Make sure that there is no coolant leakage.
     

  44.  

 
label.common.footer.alt.autozoneLogo