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Do a search online type how to change thermostat on ( your ) make /model/year then watch the video. Some thermostats Re mounted under the top hose on the radiator where in mounts to the motor. Some models have the thermostat mounted in the water pump housing.
The exact location of the thermostat varies depending on the particular engine model on your Pontiac Montana. Although 2.0L turbo and non-turbo engines locate the thermostat on the upper section of the engine, other models may follow the lower radiator hose to a lower position on the engine, requiring the removal of one or more components for replacement. see below
2Locate the thermostat housing by following the upper or lower radiator hose from the radiator towards the engine. The end of the hose should be connected to an aluminum or metal housing attached to the engine by two mounting bolts.
3Remove the air cleaner duct assembly and the crossover exhaust pipe, if necessary, using a wrench and ratchet and socket.
4Place a drain pan underneath the radiator drain valve. Open the valve and drain some of the coolant to empty the radiator hose; then close the valve.
5Remove the radiator hose from the thermostat housing by disconnecting the clamp using a pair of rib joint pliers, Phillips screwdriver or ratchet and socket, depending on type of clamp used on your particular model; then remove the hose.
6Remove the two thermostat housing bolts and lift the housing off the engine. Before removing the thermostat off the engine, pay careful attention to the position of the relief valve on the thermostat in relation to the mounting base on the engine, looking for any special marks. The new thermostat has to be mounted in this same exact position. Also, note that the thermostat spring has to point towards the engine once it is seated on the engine; then remove the thermostat and any gasket material if necessary.
1Clean the thermostat housing and engine mounting surfaces from gasket material, if necessary, using a plastic scraper; also, clean the bolt threads of the thermostat housing bolts of sealer, if necessary, using a wire brush.
2Apply a light coat of Room Temperature Vulcanizing (RTV) sealer to the new paper gasket if your particular model requires one; or install a new O-ring to the center of the thermostat; also, apply a light coat of RTV sealer to the threads of the thermostat housing mounting bolts.
3Install the new thermostat on the engine mounting base in the same exact position as the old one; install the paper gasket if required and set the thermostat housing in place. Start the housing mounting bolts by hand and then tighten the bolts.
4Connect the radiator hose to the thermostat housing; then install the crossover exhaust pipe and air cleaner and duct assembly, if necessary. Fill the radiator with new coolant, start the engine and let it reach operating temperature. Check for leaks and add more coolant to the reservoir to bring the level between the Add and Full Hot marks and turn off the engine.
5Bleed the cooling system if the thermostat housing is provided with a valve screw on it. Once the engine reaches operating temperature, loosen the valve screw until coolant begins to leak through the screw; then tighten the screw again
Before servicing the vehicle, refer to the precautions at the beginning of this section.
Remove or disconnect the following:
Negative battery cable
Coolant until level is below thermostat
Support bracket located near rear of alternator (A/C Vehicles)
Alternator drive belt by attaching a wrench to the pulley mounting bolt of the automatic tensioner, rotating the tensioner clockwise to release belt tension, and removing the belt:
Alternator mounting bolts, but do not remove any wiring at alternator
4WD indicator lamp wiring harness (4WD vehicles)
Alternator and position aside
WARNING When servicing constant tension hose clamps, use only tools designed for servicing this type of clamp, such as special clamp tool (number 6094). Always wear safety glasses when servicing constant tension clamps. Always replace constant tension clamps with the same numbered clamp.
Radiator hose clamp and upper radiator hose at thermostat housing and position wiring harness aside to gain access to thermostat
Thermostat housing mounting bolts, thermostat housing, gasket and thermostat
Clean intake manifold and thermostat housing mating surfaces.
Install or connect the following:
Thermostat (spring side down) into recessed machined groove on intake manifold
Gasket on intake manifold and over thermostat
Thermostat housing to intake manifold
NOTE: The word FRONT is stamped on housing and must be placed towards front of vehicle.
Housing-to-intake manifold bolts.
Torque to: 200 inch lbs. (23 Nm)
Upper radiator hose to thermostat housing
Alternator (A/C Vehicles)
Torque to: 30 ft. lbs. (41 Nm)
Torque to: 40 ft. lbs. (54 Nm)
Drive belt over all pulleys except idler pulley
Socket/wrench to pulley mounting bolt of automatic tensioner and rotate clockwise
Belt over idler pulley, let tensioner rotate back into place and remove wrench
Follow the TOP hose on your radiator to where it connects on your engine block. The thermostat is under the metal piece mounted to the block which the hose is connected to. It typically has to bolts to remove and you will find the thermostat under it once you remove the mounting.