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Q:

overheating on 1995 Lexus ES300

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
where is the thermostat on this engine.
Will a bad radiator cap cause overheating?
(1) Answer
Its usually where the upper radiator hose meets the engine (thermostat housing) and the thermostat housing usually has 2 or 3 mounting bolts, Stop by a Napa auto parts and have the counter person point it out to you

Yes, Each vehicle has a certain PSI radiator cap and once it looses its pressure holding capability it could overheat as coolant and water has a higher boiling point when its under pressure. Have a shop pressure test your cooling system http://repairpal.com/directory?address=33025&car_brand_names=Lexus