yes unless it's aftermarket and has an o ring.
The thermostat is inside of the thermostat housing, where the top radiator hose connects. You will need to disconnect the top hose and unbolt the thermostat housing to get to the new thermostat. Make sure that the new unit comes with a housing gasket, as some gaskets are sold separately. Make sure to clean all of the old gasket off, and use gasket sealer as per the installation instructions.
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 housing gasket may be bad. Replace the gasket.
Drain radiator. Trace your lower radiator hose back to where it mounts to engine. Inside that housing is the thermostat. Remove lower radiator hose. Unbolt the housing (you'll need to pry it off because off the sealant used in installation) and pull out the thermostat. Note orientation of themostat inside housing. Clean off all traces of old gasket material. Make new gasket with RTV gasket goop, using a thin bead. Installation is reverse of removal.
Just the thermostat and the gasket.
Unless the housing is damaged, there is no reason to replace it. Just replace the gasket.
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.
thermostat gasket probably leaking. replace thermostat and gasket making sure that thermostat housing is flat.
It's actually easier to replace a Saturn thermostat than most other vehicles. Simply remove the thermostat housing and get a new one. The thermostat is molded into the housing. Remove the radiator hose to the housing, then remove the two nuts that hold the thermostat housing to the engine. You may need to work at breaking the housing loose since the gasket has probably seized to the engine. Simply clean off any left-over gasket, and put the new gasket and thermostat housing in place.
Remove the housing and replace the gasket.
The old thermostat will simply lift out. Drop in the new thermostat. Put a new gasket on the thermostat housing. Secure the thermostat housing with the retaining bolts.
Drain the radiator. The thermostat is in a housing connected to the water pump. Remove the housing to replace the thermostat and gasket.