The car is running hot it has 180,000 miles what could be causing it.? on 1995 Lexus SC400

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1994 Lexus SC400 running hot has 182,000 miles what could it be?
(1) Answer
You have to check the basics. Is the cooling system full of coolant? Are there any air pockets (recent repairs performed?)? Does the cooling fan turn on when the engine is idling and warm? Can you verify thermostat operation - opening when desired? Is the water pump circulating the coolant through the engine as required?

A qualified technician needs to address some of these questions. Here is a link to some shops near you:

Good luck!