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Eric, Automotive Repair Shop Manager
Category: Honda
Satisfied Customers: 32377
Experience:  20+ yrs. experience as repair shop manager and technician.
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How do I change the heater core in a 91 accord

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How do I change the heater core in a 91 accord?



Ok, you will need to remove the dash in order to remove the heater box to remove and replace heater core:



Instrument Panel(dash):


  1. Disconnect the negative battery cable Slide the seats back all the way.
  2. Remove the console.
  3. Remove the knee bolster and lower panel.
  4. Remove the steering column. Observe all precautions for SRS systems.
  5. Disconnect the dash wiring harness from the individual connectors and the fusebox.
  6. Remove the clips securing the carpet and disconnect the antenna lead.
  7. Disconnect the heater control cable and function control cable.

Click image to see an enlarged view

Fig. Fig. 3: Dashboard removal on 1990-93 Accord

  1. Remove the caps on the side panels of the dashboard.
  2. Remove the clock.
  3. Remove the seven mounting bolts.
  4. With an assistant, lift the dashboard and remove it from the vehicle.

To install:

  1. Fit the dash into position, making sure the guide pin is engaged.
  2. Install the bolts and tighten them just snug. Check the position of the dash in all dimensions and adjust as necessary. When properly positioned, tighten the mounting bolts. Double check for pinched wires or interference with heater control cables.
  3. Install the clock. Install the caps on the side panels.
  4. Connect the heater control and function cables.
  5. Connect the antenna lead, then reposition and secure the carpet.
  6. Connect the dash harness to the individual connectors and the fusebox.
  7. Install the steering column.
  8. Install the knee bolster and lower panel.
  9. Connect the negative battery cable graphic




Heater Core:


  1. Disconnect the negative battery cable. If so equipped, disable the Supplemental Restraint System (SRS).
  2. Drain the engine coolant.
  3. Label and disconnect the heater hoses at the firewall. Be prepared to contain spilled coolant from the hoses and fittings.
  4. Disconnect the heater valve control cable from the valve.
  5. Remove the dashboard.


Fig. Fig. 7: Heater assembly used on 1990-93 Accords

  1. Remove the dashboard support pipe.
  2. Remove the 4 mounting bolts, then remove the heater assembly.
  3. Remove the heater core cover and the clamp securing the heater core.
  4. Remove the core from the heater assembly.


Eric and 2 other Honda Specialists are ready to help you
Customer: replied 8 years ago.
Thank you this is exactly what I needed.