Question about 1991 Honda Civic

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There is coolant leaking on the passenger side underneath of the car and rear of engine. It doesn't seem to be the lower hose and both the rad and thermostat are new and appear to be dry. I suspect the heater core but wonder how didficult it is to get at it.

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Agree, heater core. see procedure below


  1. Disconnect the negative battery cable and disable the SRS system (if equipped.)
WARNING All SRS wire harnesses are covered with a yellow insulation. Read the SRS precautions found in this section and install the short connectors as described.
  1. Properly drain the cooling system.
  2. Disconnect and plug the heater hoses at the firewall.
  3. Disconnect the heater valve control cable.
  4. Remove the heater unit attaching nut on the firewall.
  5. Remove the dashboard as follows:
    1. Remove the center panel.
    2. Disconnect the wire connectors at the fuse box.
    3. Disconnect the sunroof switch connector, if equipped.
    4. Disconnect the ground cable at the right of the steering column and the power mirror switch wire connector.
    5. Remove the side air vent knob and face plate.
    6. Remove the screws attaching the air vent control lever.
    7. Remove the center panel, radio and heater control head.
    8. Remove the gauge upper panel (4-door) or instrument panel (3-door).
    9. Disconnect the speedometer cable.
    10. Remove the center upper lid.
    11. Remove the side defroster garnishes on both ends of the dash.
    12. Lower the steering column.
    13. Remove the dashboard mounting bolts.
    14. Lift and remove the dashboard assembly.

  6. Remove the heater duct.
    There is coolant leaking on - 177f070.gif

Fig. Fig. 1: Removing the heater duct assembly

  1. Remove the steering column bracket and duct assembly.
  2. Remove the heater assembly mounting bolts.
  3. Remove the heater assembly and remove the heater core.


Fig. Fig. 2: Removing the heater case assembly

Fig. Fig. 3: Removing the heater core from the heater case

To install:

  1. Install the heater core into the heater unit.
  2. Install the heater assembly and the attaching bolts.
  3. Install the heater duct and steering column bracket.
  4. Install the dashboard assembly. Tighten the mounting bolts until just snug.
  5. Raise and attach the steering column.
  6. Install the center upper panel.
  7. Connect the speedometer cable and install the instrument gauge assembly.
  8. Install the control head, radio and center panel.
  9. Install the side vent and face plate.
  10. Connect the ground cable at the right of the steering column and the power mirror switch wire connector.
  11. Connect the sunroof switch connector, if equipped.
  12. Connect wire connectors at fuse panel.
  13. Install the heater unit attaching nut on the firewall.
  14. Connect the heater valve control cable.
  15. Connect the heater hoses at the firewall.
  16. Connect the negative battery cable.
  17. Fill, bleed and leak check the cooling system.

Posted on Oct 05, 2010

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Put some hose clamps on the hoses and see if it still leaks

Posted on Oct 05, 2010


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