the thermostat is located on the exhaust side of the engine. The lower radiator hose will run to right behind the alternator and inside the housing where the lower hose attaches the thermostat is inside. You may have to remove air filter hose in order to give yourself room
THE THERMOSTAT IS ON THE BOTTOM HOSE BEHIND OF THE ALTENATOR. ITS A B1T
Thermostat is stuck closed.
The Lexus GS 300 thermostat is located on the front of the engine. You can find the thermostat by following the radiator hose to the thermostat.
Call a mechanic, or buy a Chiltons.
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the thermostat is next to the water pump. Follow the lower radiator hose from the rad to the engine. that is were you will find the thermostat.
Follow the link below, labeled "How to replace a Lexus IS300 tail light"
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Probably at the engine end of the upper radiator hose