sounds like the fuel sensor inthe fuel tank which means removing tank to replace
you will need to replace the fuel sensor and it is all in one with the fuel pump its in the gas tank.
drop the gas tank and change the sending unit
How to fix a gas hand on a 2001 Pontiac Bonneville
Without knowing what is wrong with the system there is no way to determine the cost.
2002 Montana Seat Repair
you fix it
Go to a Pontiac Mechanic and spend a few bucks.
Get the head gasket problem fixed.
un jam the dame thing
Fix It.
To fix the passenger side power window on a 2001 Pontiac Montana that doesn't go up, first check the fuse related to the power windows; replace it if it's blown. If the fuse is intact, inspect the window switch for any damage or malfunction. You may need to remove the door panel to access the window motor and wiring; check for loose connections or a faulty motor. If the motor is unresponsive, it may need to be replaced.
Replace the lever with a new or good used one.