Repair Pontiac Mid-size 1974-1983 Repair Guide
Heater Core
REMOVAL & INSTALLATION
1974-77 GTO, LeMans and Grand Am
WITHOUT AIR CONDITIONING
1. Drain the radiator.
2. Disconnect the heater hoses at the air inlet assembly.
3. Remove nuts from core studs on firewall (under hood). Remove the glove box. On 1977 LeMans, remove glove box and door, then remove heater outlet from case. Remove defroster duct screw on all models.
4. From inside the car, pull the heater assembly from the firewall.
5. Disconnect control cables and wires, then remove heater assembly.
6. To remove core, unhook retaining springs or strips.
7. To install, reverse removal procedure, making sure core is properly sealed during installation.
WITH AIR CONDITIONING
1. Drain the coolant.
2. Disconnect the water hoses at the heater core tubes to prevent spilling coolant during removal.
3. Remove the glove compartment.
4. Remove the cold air duct and heater outlet. Download File PDF
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