GM Firebird 1967-1981 Repair Guide

Thermostat

Print

REMOVAL & INSTALLATION



See Figures 1 through 9

Click image to see an enlarged view

Fig. Fig. 1: To remove the thermostat, tag any vacuum lines (if applicable) ...



Click image to see an enlarged view

Fig. Fig. 2: ... then disconnect the lines from the thermostat housing



Click image to see an enlarged view

Fig. Fig. 3: If necessary, the coolant hose can be disconnected loosen the hose clamp ...



Click image to see an enlarged view

Fig. Fig. 4: ... then pull the hose off of the housing



Click image to see an enlarged view

Fig. Fig. 5: Often, a flex extension (arrow) can make hard-to-get bolts easier to remove



Click image to see an enlarged view

Fig. Fig. 6: Remove the housing mounting bolts ...



Click image to see an enlarged view

Fig. Fig. 7: ... then lift the housing up and off of the intake manifold



Click image to see an enlarged view

Fig. Fig. 8: Lift the thermostat out of the intake manifold recess ...



Click image to see an enlarged view

Fig. Fig. 9: ... and clean the old gasket off of the mounting flange


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

  1. Drain the coolant to below thermostat level.
  2.  
  3. Remove the two retaining bolts from the thermostat housing (it is not necessary to remove the radiator hose from the thermostat housing). The thermostat housing is located on the front top of the intake manifold on V6s and V8s and directly in front of the valve cover on inline 6-cylinder engines.
  4.  
  5. Lift the thermostat out of the housing.
  6.  
  7. Clean the gasket surfaces, use a new gasket and gasket sealer, then install the new thermostat with the "spring side" down.
  8.  
  9. Tighten the thermostat housing bolts to 20-30 ft. lbs. and refill the radiator.
  10.  

 
label.common.footer.alt.autozoneLogo