The thermostat on a 2005 Chevy Equinox is changed by draining the radiator, removing the upper radiator hose, and unbolting the radiator housing. The old thermostat can then be removed, a new gasket installed, and the housing bolted down.
One can change the thermostat on a Chevy car by draining the coolant and disconnecting the upper radiator hose. The thermostat housing is then unbolted, the old thermostat removed, and a new unit placed in the housing.
Remove the water supply hose from your 1992 Chevy thermostat housing. Remove the thermostat housing retaining bolts. The thermostat can be lifted out. Reverse the process to install the new thermostat.