Car keeps overheating after new water pump , new tstat,and radiator still overheating dianostic shows no codes trip computer has no messesages of a problem whats going on?

Go to advanced auto they can hook up computer to your vehicle and tell what's wrong for free.

sounds like the fan clutch might have failed .

thermostat backwards?

If it over heated before the thermostat, replace the radiator cap. Make sure the coolant (recommend just water until this is fixed) is full. When disconnecting the upper hose you lose all the coolant from the engine and about 1/3 of the coolant in the radiator. If you only full the radiator you don't have enough water. The new remonstrate needs to open for you to get enough water. In short- take radiator cap off. Start the engine. Fill radiator. Watch level for 5min, filling as needed.

If the overheating is only occasional, it sounds like the radiator still has some blockage that moves around and plugs up again. Try flushing it backwards again. If it continues, consider a new radiator. A radiator is cheaper than head gasket work, which may happen if it keeps overheating.

your car problem is overheating, some car model like yours is designed to shut-down engine when engine temp. rise so as to avoid frying the engine. your engine overheating problem is attributed by one of these factors:
1. check or refill radiator water if less
2.check radiator cooling fan operation-if damaged pls. change or check the electrical system.
3. damage/ worn water pump-if damage pls. change the water pump.
4. check for any coolant leak somewhere the coolant line-pls. rectify the leak.
5.worn coolant reservoir cap- change if damaged.
6. clogged radiator-if clogged pls. change it.
7. damaged thermostat valve.

perform a pressure test on the cooling system,it will tell you if you have a engine overheating problem.
also look at your oil and see if you have water in your oil,test your exhaust pipe for signs of antifreez coming out of the engine.

replace radiator cap system depends on good pressure to keep from overheating

just installed a new water pump and thermostat my 97 trans am keeps overheating,anyone know why?

Your radiator efficiency has been reduced by (what is called) blossoming. Blossoming is electrolytic growth of crystals inside radiator duct passages. This typically occurs in the older Troops as gradual overheating probs cause the vehicle to run low on coolant, then water is being used to top off system repeatedly, acid levels in cooling system rise as the coolant protectants degrade and the inside of the radiator ducts 'blossom' with small crystalline growths that reduce the radiators flow and ability to cool the engine. Flushing and blowing out the radiator are temporary fixes. Replacing the radiator is the permanent fix. You did the right thing by replacing the water pump, tstat and radiator cap. An old, original water pump usually fails soon after the radiator is replaced. New Trooper radiators are fairly cheap, $85+. The replacement can be done by any backyard mechanic or DIYer in under and hour. You know the typical warnings about the toxicity of antifreeze and the deadly affects on pets who drink improperly disposed coolant. Good luck to you. It's an easy remove and replace. Your Trooper will thank you with many cool running miles. -Geoff