The thermostat is taking long time to change. Is situated in right side of the engine (from front of vehicule). Just follow the big hose from the radiator and you will see the headbow. It's between the exaust manifold extension and the engine just below the throttle body. If you want to change it and make it easier, you will have to remove the throttle body (consist in 3 bolts). Once is done, just remove the headbow and that's it. (the job is approximately 1 hour and half for professionnal and more thant 3 hours for user).
http://car.justanswer.com/uploads/JHoop/2008-05-03_202404_Thermostat.pdf
check this site------>
The ECM on a 1998 Pontiac Transport with the 3.4 V6 engine is located on the passenger side. It is behind the glove box.
A 1998 Pontiac Transport with the 3.4L engine typically requires a thermostat with a 195°F temperature rating. The thermostat's diameter is generally 1.75 inches. Always check your vehicle's manual or a trusted parts supplier to confirm specifications for your specific model.
how do you change a brake booster valve to a 1998 Pontiac transport
It is located behind the crankshaft pulley and requires the pulley to be removed to change it out.
To remove the thermostat housing on a 1998 Pontiac Transport, first, ensure the engine is cool and disconnect the negative battery cable. Drain the coolant from the radiator and remove any components obstructing access to the housing, such as the air intake duct. Unscrew the bolts securing the thermostat housing and carefully lift it off, taking care not to damage the gasket. Finally, remove the old thermostat and clean the mating surfaces before installing the new thermostat and housing.
I have a 98 GT it was underneath yhe car just follow the water hose
Off the water pump
What causes a 1998 Pontiac transport to run hot and engine shuts off
outside of tank.located in front of tank
3400 v6
It could be the thermostat. Open up the radiator cap when it is hot and see if the water is flowing in the radiator. If it is not then it may be a thermostat.