Yes, no matter what part u change, if there's a gasket involved, u always replace the gasket. Make sure u clean both surfaces.
You should use a thermostat gasket along with the thermostat housing ring. The gasket should be replaced every time the thermostat housing is opened.
The thermostat on a 2003 Pontiac Grand Am 2.2L L4 Ecotec is replaced by removing the upper radiator hose and unbolting the thermostat housing. The thermostat can then be removed, a new gasket installed, and the replacement thermostat put in place.
take apart the thermostat housing and pop it out be sure and replace the gasket too. There should be two bolts holding it together.
Remove the thermostat housing screws and separate the housing, exsposing the thermostat and coolant, remove old thermostat and gasket. Reinstall new thermostat, gasket and coolant.
In general, engine thermostats can be found by following the LOWER radiator hose to where it attaches to the engine. The hose is typically attached to a fitting behind which is a gasket and the thermostat. The gasket needs to be replaced when the thermostat is replaced.
YES
You will need a new head gasket if you see engine coolant in the oil. I don't know about the thermostat.
If you needed a gasket and they replaced it then yes you would be charged for the gasket.
bad thermostat or bad heat gasket
Leaking hose? Defective thermostat housing or bad thermostat gasket? Bad water pump or gasket? Leak in radiator? Leak at heater core? Leak at head gasket? Coolant recovery tank?
by the lower intake manifold while you are doing this you should replace the intake manifold gasket anyway because it will leak sooner or later.
Was the gasket replaced? Have you checked the hose and the heater core. Is everything tightened down?