I have a 1992 buick skylark v6 3300 it is overheating no leaks no oil in the water or water in the oil no antifreeze in te exaust just changed the thermostat

Could b a bad fan or relay if electric fan bad clutch if clutch fan

Clogged radiator

If your engine is overheating, Try this procedure:

• Dirt and debris can get lodged in the radiator air flow paths. This can block the radiator and cause your engine to overheat and damage the engine

• Make sure the radiator and the overflow bottle are filled to the proper levels.

• Bleed air from the coolant system:This is best done by running the engine with the radiator cap off until you see when the air bubbles stop coming up.

• Check the radiator fans: The easiest way is to turn on the cars air conditioner and turn up the A/C fans. Both radiator fans should come on when the A/C starts

• Make a pressure test by using a pressure testing tool (available at most auto parts stores). Use the pressure shown on your radiator cap. Most cars are 16 PSI or less, so don't exceed that pressure. Replace the radiator cap if it doesn't hold the pressure.

Probably the water pump, when the engine is completely cool, open the radiator cap, start the engine, turn on the heat full, and check to see if you have circulation at the radiator cap nosal you should see movement of water if pump is good....