My 1992 lexus es 300 overheats after i get off the freeway. the temp gauge sits in the normal position until i get off the freeway. i run the heat on hot and at full blast regardless of the temp outside and i notice that the air cools down when it starts to overheat. i replaced the thermastat 2 days ago and the temp was fine until this afternoon.

Check the basics first start with water and oil levels make sure they are where they need to be. If that doesn't work try replacing the thermostat

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These details will help.
Thanks.

Does a Lexus ES 300 camshaft position sensor WHAT???

If you are asking if a 1992 Lexus ES 300 is equipped with a camshaft position sensor, the answer to your question is NO. Otherwise, you need to clarify exactly what you are asking.

Hi. If your getten warm heat but not hot, ITs most likely your thermostat which can cause your car to overheat.

MAKE SURE ENOUGH COOLANT IN COOLING SYSTEM. ALSO MAKE SURE COOLING FANS ARE WORKING.IF CAR SITTING AND IDLING IN A LONG TRAFFIC JAM ON FREEWAY OR ELSE WHERE.IF COOLANT FANS DONT COME ON CAR WILL OVERHEAT BOIL OVER.HAVE CAR SCAN FOR A FAULTY COOLANT TEMPERATURE SENSOR FAULT.AND CHECK THE COOLING FANS FUSE AND RELAYS.MAKE SURE COOLING FANS ARE WORKING.ALSO PUT COOLANT BACK IN TO MAKE UP WHAT BOILED OUT.

If you see no leaks and the fluid level is also good in the rad overflow bottle. It could be the water pump. When the car is running do you feel the hoses are hot and pressurized. Do you feel heat with your heater cranked up. The coolant may not be circulating. This would mean you need a new water pump, most likely the impeller is worn/broken inside. It can be fixed by yourself but will require some skill and time.

you need a FAN temp control switch or relay or run a toGGl switch

preform a pressurized collant flush , take it to a raidior shop to have it done , they will clean and blow out all blockages that might cause your car to over heat. also check to make sure you dont have air pockets in your anit freeze, if you do you need to bleed the system out after you have it flushed , your car should have a blead valve to let out the axcess air ,if not drive it down the road with the cooaint overflow cap off , not the radiator but you need to flush out the system first , add new anti freeze then bleed out all air pockets, hope this helps

How do I change Dashboard lights

The only way to check why the check engine light is on is to have autozone or a mechanic put a scanner on the car and read the engine codes. This will tell you exactly what is wrong. Many part stores will test it for free. Mechanics will charge about $40 But you will definately know exactly what the problem is.

If gauge is fine and car smells hot. It is probably due to plugged exhaust unless you have a wire laying on the exhaust manifold and it's melting.