No , there is a rubber ring that goes around the edge of the thermostat
remove old thermostat and replace with new thermostat and gasket
Replace the thermostat gasket.
Unless the housing is damaged, there is no reason to replace it. Just replace the gasket.
Just the thermostat and the gasket.
To replace the thermostat on a 1988 535i, first locate the top radiator hose and remove the end connected to the motor. Take out the old thermostat and use gasket cleaner to remove the old gasket. Then replace the gasket and thermostat exactly as it was when it came out. Tighten up the radiator hose over the thermostat.
thermostat gasket probably leaking. replace thermostat and gasket making sure that thermostat housing is flat.
cost to replace a head gasket
The housing gasket may be bad. 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.
Most definitely... If you don't and the thermostat is bad you will over-heat the engine and the gasket may leak or warp the head. Thermostat is a lot cheaper than tearing down the engine again.
Replace the thermostat housing seal or gasket.
There's a gasket between the thermostat and the block that you need to replace.