I have a 1999 chevrolet cavalier and the engine began to overheat. i took it to pepboys and they replaced a fan but it still has not reolved the problem.Is there anything that you could suggest.

Probably a faulty coolant temperature sensor.

My 2001 Cavalier was overheating, as well. We replaced the radiator cap, and this stopped the issue. Pressure wasn't building up to run fluid through the hoses, which you could check visually. Also, if a cap doesn't do the trick, and you've already checked that your radiator is full, you could get a new water pump installed. I bought one at a pepboys and it was around $30. Also, there could be a fan issue. I replaced my fan as well (the radiator cap was the last suggested fix, but it was the cheapest). The fan was about $10? Nothing too expensive in this group of solutions, though.

Check the coolent in the 97 cavalier it takes the orange coolent not the green stuff. If you do have green coolent in it you will have to flush the radiator a few times before adding the new coolent.

REPLACE THE THERMOSTAT

if the wiring is good and there are no blown fuses, likely the gauge itself will have to be replaced

check the coolant for hydrocarbons as that will comfirm the headgasket problem all those symptoms would indicate..

have your O2 sensor checked. They could both be bad

Did you have oil in it. depending on the severity of the overheat you may have seized the engine. You also could have a head gasket problem. The cooling system on these little cars can overheat in heavy traffic and going up a hill a little too fast. Solution? If it started and showed white smoke out of the exhaust. Head Gasket. If it won't turn over with the starter it's seized. Both will cost a mint. If you had no oil engine could now be junk.

Try to remove the thermostat and run it without it. If it does not overheat then you just have a defective one if you have replaced it. Or ou accidentally put it in backwards. It will not hurt anything.

maybe the head wasnt torqued right and is allowing the car to overheat