How do you replace a heater core in a 90 ford cargo van?

Drain the cooling system.

  1. Disconnect the heater hoses at the core tubes in the engine compartment.

  2. Remove the instrument panel lower trim panel
  3. Remove the heater core cover from the left side of the heater case (4 screws).
  4. Remove the core retaining retainers and if necessary bracket from the case.
  5. Lift out the heater core and seal.