one issue could be that you need to change your thermostat
how do you change a battery on a 2002 Pontiac Montana
Where is the heater core for a 2002 pontiac montana
the 2002 Pontiac Montana came with a 3.4L engine.
2002 Montana Seat Repair
Where
How to disengage Pontiac Montana 2002 anti-theft system
2002 Montana holds 4.25 Litres including the oil filter.
p215/70R15
Pontiac does not use inertia/reset switches.
you cant
Low coolant Water pump not working properly Cooling fan not working Thermostat not opening fully Radiator plugged or dirty Check the radiator fan.
The gas tank in my extended 2000 Pontiac Montana is 25 gallons. I would imagine the 02 is the same.