I have a 2000 Pontiac and my was doing the same thing. It turned out to be my heads were warped. You can smell it coming out of your tail pipe if it is your heads.
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.. :)
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.
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.
Low coolant Water pump not working properly Cooling fan not working Thermostat not opening fully Radiator plugged or dirty Check the radiator fan.
Before changing the radiator on a 2001 Pontiac Montana the coolant must first be drained. After the drain remove the radiator mounts, fans, and hoses. Pull the radiator upwards.
Check the coolant level. Not just the bottle but in the radiator too. The 3400 motor is known for leaking coolant at the intake manifold.
yes it has one
On a 3.4L engine there is a metal adapter bolted to the engine that the upper radiator hose attaches to. It is on the right side and is a nightmare to get to. Many parts must be removed to get the adapter off. The thermostst is inside the adapter.
If it is a plastic radiator and it is stripped, no, if it is metal yes.