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How do you replace the thermostat on a 99 model Pontiac grand am?
Wiki User
∙ 14y ago
On the 2000 models with the 3400 engine in it you must first remove the throttle body. Removing the throttle body makes access to the thermostat housing very easy. Simply take 2 bolts out of the housing and remove the thermostat. After replacing thermostat you must bleed the air out of the system because it is pressurized. Not bleeding out the air can cause severe engine damage if allowed to run. overheatin of the engine is the first sign.
Wiki User
∙ 14y ago
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