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How do one change the thermostat in a 1998 Pontiac Bonneville?
Wiki User
∙ 12y ago
Disconnect negative battery terminal for your safety. Follow directions to remove the upper radiator hose. Inside the metal pipe on the engine where you removed the hose, is where you will find the thermostat. You will need a 10mm socket with an extension arm to remove the two bolts. Pull out the thermostat, noting it's position, and push in the new thermostat with new gasket attached and screw back together. Replace hose and refill coolant.
Wiki User
∙ 12y ago
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