could be low coolant due to a leak, clogged rad, inoperative cooling fan, thermostats.... overheating conditions can have alot of causes. you need to do some digging.
2001 Pontiac Montana?
You are OVERHEATING. You most likely have an intake or Head gasket problem.
Pontiac Montana was created in 1999.
Will Pontiac Montana rims fit WHAT? Your question is not complete. What do you want to fit the Montana rims on?
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The 2000 Pontiac Montana does not have a vacuum modulator installed on it. Instead, it has an electronically controlled transaxle.