Pontiac Mid-size 1974-1983 Repair Manual Download Page 6

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Fig. Fig. 14 Remove the heater core bracket retaining bolt ...

Fig. Fig. 15 ... then remove the heater core from the case

1974-77 GTO, LeMans and Grand Am

WITHOUT AIR CONDITIONING

Drain the radiator.

Disconnect the heater hoses at the air inlet assembly.

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.

From inside the car, pull the heater assembly from the firewall.

Disconnect control cables and wires, then remove heater assembly.

To remove core, unhook retaining springs or strips.

To install, reverse removal procedure, making sure core is properly sealed during installation.

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8/10/2009 10:14 AM

Summary of Contents for Mid-size 1974-1983

Page 1: ...1983 Repair Guide Heater Core REMOVAL INSTALLATION REMOVAL INSTALLATION Fig Fig 1 Exploded view of the heater assembly components 1980 81 LeMans shown Fig Fig 2 Heater cable routing Phoenix and Ventur...

Page 2: ...ig 3 Heater control cable and panel mounting LeMans and Grand Prix Fig Fig 4 To remove the heater core unfasten the lower windshield trim panel screws Fig Fig 5 then remove the lower windshield trim p...

Page 3: ...Fig Fig 6 Remove the rubber seal from around the cowl screen Fig Fig 7 If necessary disconnect the windshield washer hose...

Page 4: ...Fig Fig 8 Unfasten the windshield cowl screen retainers Fig Fig 9 then remove the cowl screen Fig Fig 10 Unfasten the heater case cover retaining bolts 4 of 11 8 10 2009 10 14 AM...

Page 5: ...Fig Fig 11 then remove the heater case cover assembly Fig Fig 12 Unscrew the heater hose clamps Fig Fig 13 then disconnect the heater hoses from the core 5 of 11 8 10 2009 10 14 AM...

Page 6: ...on firewall under hood Remove the glove box 3 On 1977 LeMans remove glove box and door then remove heater outlet from case Remove defroster duct screw on all models From inside the car pull the heate...

Page 7: ...tallation 11 1978 81 LeMans and Grand Am WITHOUT AIR CONDITIONING On some vehicles it may be necessary to remove the lower windshield trim rubber seals and or screens for access to the heater core 1 D...

Page 8: ...eater core pipe the other hose from rear of right cylinder head goes to the left hand heater core pipe Remove the nuts from the core studs on the firewall under hood Remove the glove compartment 3 Fro...

Page 9: ...istor to gain access to the upper retaining nut inside the evaporator case 4 Remove the glove box the cold air duct and the heater distributor tube 5 Remove the lower defroster duct tube screw 6 Remov...

Page 10: ...e a strip of wood to the lower edge of the windshield glass to protect the glass 8 Remove the top cover screws 9 Cut the sealing material along the cowl with a knife 10 Pry the cover off from the side...

Page 11: ...1977 Pontiac Grand Prix 6 6L 4BL 8cyl 11 of 11 8 10 2009 10 14 AM...