G 3500 1 Ton Van V8-350 5.7L VIN K TBI (1987)
10. Remove temperature door cable.
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Fold the cable back for access.
11. Remove heater case and core.
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Three nuts at the engine compartment side of the distributor case and one screw on the passenger side.
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Tilt the case assembly rearward at the top while lifting up until the core tubes clear the dash openings.
12. Remove core retaining strap screws.
13. Remove heater core.
Installation