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first remove battery, remove air intake box, removewires, hose connections, nut holding heater lines coming from fill tank and remove. Remove 4 nuts holding heat shield on cross over exaust pipe , two bolts holding thermostat housing, remove and replace thermostat. after filling system be sure to open purge bolt and remove air from cooling system. not fun.

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Q: How do you change the engine thermostat on a Pontiac 3.4?
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