GM Camaro/Firebird 1993-1998 Repair Guide

Thermostat

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REMOVAL & INSTALLATION




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.

Except 3.8L Engine

See Figures 1 through 7

  1. Disconnect the negative battery cable. Place a suitable drain pan under the radiator.
  2.  
  3. Open the radiator drain cock and drain the cooling system a level below the thermostat. Close the drain cock and tighten to 13 inch lbs. (1.5 Nm).
  4.  
  5. Disconnect the air cleaner duct and remove the air cleaner.
  6.  
  7. Remove the inlet hose and clamp from the water outlet.
  8.  



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Fig. Fig. 1: Use a pair of pliers to unfasten the hose retaining clamp



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Fig. Fig. 2: Disconnect the hose from the water outlet

  1. Unfasten the water outlet bolts/screws, then remove the outlet.
  2.  



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Fig. Fig. 3: Unfasten the water outlet retaining bolts ...



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Fig. Fig. 4: ... then remove the outlet to access the thermostat

  1. If equipped, remove and discard the water outlet gasket. Remove the thermostat from the intake manifold or water pump.
  2.  



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Fig. Fig. 5: Remove the thermostat from the water pump

  1. Thoroughly clean the gasket mating surfaces of the water outlet and upper intake manifold.
  2.  



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Fig. Fig. 6: Exploded view of the water outlet and thermostat - 3.4L engine



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Fig. Fig. 7: Exploded view of the thermostat mounting - 5.7L engine

To install:
  1. Place the thermostat into the intake manifold or water pump, as applicable. If equipped, place a new gasket over the thermostat.
  2.  
  3. Install the water outlet and secure with the retaining bolt/screw. Tighten to 21 ft. lbs. (28 Nm).
  4.  
  5. Install the inlet hose and clamp to the water outlet.
  6.  
  7. Install the air cleaner and air intake duct.
  8.  
  9. Fill and bleed the cooling system.
  10.  

3.8L Engine

See Figure 8

  1. Disconnect the negative battery cable. Place a suitable drain pan under the radiator.
  2.  
  3. Open the radiator drain cock and drain the cooling system a level below the thermostat. Close the drain cock and tighten to 13 inch lbs. (1.5 Nm).
  4.  
  5. Remove the EGR valve outlet pipe bolts/screws from the upper intake and EGR valve adapter.
  6.  
  7. Loosen the hose clamp and remove the inlet hose from the water outlet.
  8.  
  9. Unfasten the water outlet bolts/screw, then remove the water outlet.
  10.  
  11. Remove the water outlet gasket, then lift the thermostat from the upper intake manifold. Discard the gasket.
  12.  
  13. Thoroughly clean the gasket mating surfaces of the water outlet and upper intake manifold.
  14.  



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Fig. Fig. 8: Thermostat mounting - 3.8L engine

To install:
  1. Place the thermostat into the upper intake manifold. Position a new gasket over the thermostat.
  2.  
  3. Install the water outlet and secure with the retaining bolts/screws. Tighten to 20 ft. lbs. (27 Nm).
  4.  
  5. Connect the inlet hose to the water outlet and tighten the hose clamp.
  6.  
  7. Install the EGR valve outlet pipe.
  8.  
  9. Install the EGR valve outlet pipe bolt/screw to the upper intake and EGR valve adapter. Tighten the EGR valve outlet pipe-to-upper intake bolt/screw to 18 ft. lbs. (25 Nm).Tighten the EGR valve outlet pipe-to-EGR valve adapter nut to 21 ft. lbs. (29 Nm).
  10.  
  11. Fill the cooling system to the proper level with a 50/50 mixture of clean water and coolant.
  12.  
  13. Connect the negative battery cable, then start the engine and check for leaks.
  14.  

 
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