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Home › GMC › 1984 › Forward Control 6.2 J, Standard › Repair and Diagnosis › Heating, Ventilation & A/C (HVAC) › HVAC Control Systems › Heater System › Component Replacement › Heater Core › Replacement (Van Models)

Replacement (Van Models)

  1. Disconnect battery ground. Drain cooling system. Remove coolant recovery tank. Disconnect heater hoses at core, drain coolant into pan and plug openings. Remove screws attaching heater duct to case and distributor duct to engine cover. Remove duct.
  2. Remove engine housing cover. Remove instrument panel attaching screws at windshield, all lower screws and right lower instrument panel support bracket at door pillar and engine housing. Lower steering column, then raise and support right side of instrument panel.
  3. Remove defroster duct to distributor case attaching screw and 2 screws attaching distributor to heater case. Disconnect temperature door cable and fold back cable to provide access. See Fig. 3. Remove 3 nuts at engine compartment side of distributor case and 1 on passenger compartment side.
  4. Remove heater case and core as an assembly. Tilt case assembly rearward at top while lifting up until core tubes clear dash openings. Remove core retaining straps and remove core. To install, reverse removal procedure. Make sure seals are intact before installing.
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