GM Camaro/Firebird 1993-1998 Repair Guide

Heater Core

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REMOVAL & INSTALLATION



See Figures 1, 2, 3 and 4


CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Drain the engine coolant into a suitable container.
  2.  
  3. Open the instrument panel glove compartment. Push in on the sides of the compartment to release it, allowing access to the heater core.
  4.  

The heater core can be damaged if too much force is applied to the heater core pipes during hose removal.

  1. Remove the heater module screws and remove the heater module assembly cover. For vehicles equipped with A/C, remove the air conditioning evaporator temperature sensor assembly from the heater and A/C cover.
  2.  
  3. Remove the heater core screw and clamp.
  4.  
  5. Remove the hose pipe clamp screw and the hose pipe clamp. Clamp off the heater hoses.
  6.  



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Fig. Fig. 1: Heater hose and pipe routing-3.4L engine



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Fig. Fig. 2: Heater hose and pipe routing-3.8L engine



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Fig. Fig. 3: Heater hose and pipe routing-5.7L engine

  1. Disconnect the heater hoses from the pipes.
  2.  
  3. Remove the heater core by carefully pulling it towards you.
  4.  



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Fig. Fig. 4: Exploded view of the heater core removed from the heater module assembly

To install:
  1. Install the heater core and attach the heater hose assembly to the heater hose pipes. Note the following:
    1. Lubricate the heater core pipes with petroleum jelly for ease of installation and to assure a good seal.
    2.  
    3. Be sure the seals around the heater pipes remain in place when installing.
    4.  
    5. To verify that the seal is installed correctly, observe the seal from inside the engine compartment. If the seal has leaks, apply a sealer between the heater core pipes and the evaporator housing.
    6.  

  2.  
  3. Install the hose pipe clamp and the bolt/screw. Unclamp the heater hoses. Tighten the hose pipe clamp bolt/screw to 16 inch lbs. (1.8 Nm).
  4.  
  5. Install the heater core clamp and screw. Tighten the screw to 16 inch lbs. (1.8 Nm).
  6.  
  7. Install the heater module assembly cover and secure with the retaining screws. Tighten the screws to 18 inch lbs. (2 Nm).
  8.  
  9. Connect the negative battery cable.
  10.  
  11. Refill the cooling system. Operate the engine and check for leaks, add coolant if necessary.
  12.  
  13. Install the instrument panel glove compartment.
  14.  

 
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