WHERE is the thermostat located on a 1992 Lexus ES 300 ?
l was told by the lexus dealership it was the lower hose...l looked and l can not even tell where the lower hose goes because its right up against the belts...l hope the person l spoke to at lexus was mistaken (wrong year?)because if she was right its going to be a major deal to get it changed...

Follow the upper rad hose to the engine and there will be a housing there with the thernostat in it. Be sure when reinstalling it the spring goes toward the engine. If you install it backward it will overheat in about 3 minutes. If your engine is overheating, generally the thermostat is not the problem. It is the cooling fans not operating properly.

If the dealer told you it was going to be a major deal to change it. l would have to believe them. I've seen some thermostats that an alternator and a power steering pump. Had to be removed to get at it. Under the hood any more on cars is getting pretty crowded.