Probably.
The thermostat housing is dome shaped at the end of the radiator top hose on the block, and should be near the water pump which is on the front of the engine. Not looked at a Montana lay out so can't help further.. :)
To remove the thermostat from a 2001 Pontiac Montana, first, ensure the engine is cool and disconnect the negative battery terminal. Then, drain the coolant from the radiator and remove the upper radiator hose connected to the thermostat housing. Unbolt the thermostat housing, remove the old thermostat, and clean the mating surfaces before installing the new thermostat. Finally, reassemble everything, refill the coolant, and reconnect the battery.
You more than likely have a bad water pump. With the car running, open your radiator cap and see if the water is circulating through the radiator. If not, then your water pump is bad. Hope that helps...
The coolant temp sensor is located on the manifold, just to the left of the thermostat housing on the right side of the engine compartment. They are both located just under the air intake tube that attaches to the throttle body, and it has a small 2 wire connector attached to it. You can follow the upper radiator hose from the radiator to the thermostat housing to locate them. Good luck.
On a 2008 Pontiac Montana, the thermostat is located in the engine compartment, typically at the engine end of the upper radiator hose. To access it, you may need to remove the hose and possibly other components for better visibility. It's usually mounted on the engine block or intake manifold. Always consult the vehicle's service manual for specific instructions and safety precautions.
Should be located at the engine end of the upper radiator hose in removable housing
Begin by draining the coolant. Next, you have to remove the exhaust crossover pipe that runs around the rear of the engine, just over the transmission. This will require tilting the engine forward so you can reach the bolts on the rear manifold. Remove the upper radiator hose from the thermostat housing and then remove the bolts. The thermostat is in the recess in the intake manifold. Reverse the process to re-assemble. This little job took me about 4 hours to do. Good Luck and God Bless.
To change the thermostat on a 2003 Pontiac Montana with a 3.4L engine, start by allowing the engine to cool down completely. Then, drain the coolant from the radiator and remove the upper radiator hose connected to the thermostat housing. Unbolt the thermostat housing to access the thermostat, replace it with a new one (ensuring the gasket is in place), and reassemble everything by reversing the steps. Finally, refill the coolant and check for leaks before starting the engine.
To change the thermostat on a 2003 Pontiac Montana, start by ensuring the engine is cool and disconnect the negative battery cable. Drain the coolant from the radiator, then remove the upper radiator hose connected to the thermostat housing. Unbolt the thermostat housing, replace the old thermostat with a new one (making sure to align it correctly), and reassemble everything by reconnecting the hose and refilling the coolant. Finally, reconnect the battery and check for leaks after starting the engine.
To replace the thermostat on a 2002 Pontiac Montana, first ensure the engine is cool, then disconnect the negative battery cable. Remove the upper radiator hose from the thermostat housing and unbolt the housing to access the thermostat. Replace the old thermostat with a new one, ensuring the gasket is properly aligned, then reassemble the housing and hose. Finally, reconnect the battery and refill the coolant as needed.
Low coolant Water pump not working properly Cooling fan not working Thermostat not opening fully Radiator plugged or dirty Check the radiator fan.