follow lower rad hose where it connects to the block...
The hose should connect to a thermostat housing which (as name indicates) houses the thermostat
Be carefull that there are numerous other reasons that might cause vehicle to overheat, rather than thermostat...
ie: air trapped in system, expansion tank cap not sealing (can be pressure tested), water pump impellers broken, etc... Blown head gasket,etc...
You get my drift I guess...
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Fern