Overheating '99 pontiac grand-am 3.4 6 cyc, i bought this car & it keeps overheating, i have put in a new thermastic, water pump, & hoses, but it still overheats. can you help me?

These engines like the 3.8 usually have a intake leaking problem. Also the have plastic elbows on the passengers side of intake that go to heater hoses can leak also. Is it a 3.8 liter engine in your car. And where abouts does the fluid look like its coming from.

did you bleed the air from the system? how do u know u don't have a leaking head gasket, have u had it checked with a gas analyzer?

After you drain coolant remove the larger hose at the bottom of over flow tank and the 2 smaller hoses at the top. remove the 1 bolt holding the overflow tank on and remove tank. Next take serpentine belt. Take the 4 bolts off holding on the water pump pulley and remove pulley. Next remove the 5 bolts holding water pump in. Clean water pump housing of old gasket and clean with alcohol or paint thinner to remove any residue. Use a small amount of RTV sealant along with a new gasket and put in the 5 bolts tightening them by hand. Next tighten the bolt a quarter turn at a time until tight.put on pulley, put in overflow tank and attach bolt and 3 hoses .

try priming the engine block & radiator with water though the hose's & any hose you can squeeze to pump out the air lock with the filler cap off when running, sounds too much air is is in the system & the pump won't work dry.
I had this problem a few times & I ended up practically forcing water into any hose I could re-attach quickly using a garden hose, as the heating system need's priming too !

Replace thermostat.

Thermostat, cooling fans, water pump, rad (not plugged wirth scale)

thermistate housing is the place you refer to it fuction is to hold a thermastate to open and close water flow at 150 to 190 degree according to car spectif the thermaste sticks it causes overheating and can blow the thermastate gasget, the tole cost is about 30$ at most for the thermastate and gasget...now many other things can cause a car to over heat and cause a hose leak and somtimes it is simple to just tighten the hiose clamp at the thrmastate and problem sovled see a water leak causes the radiator to lose presure and thus with out a sealed tight water cooling system the boiling point of water is lower and thus the car over heats when in doubt stop by the local gas station and have a tech take a quick look as it could be simple as the hose clamp difficult as a therm,astate but do not let it go to warp a head gasket as this blown headgasket is what is the end results of running a car to hot

it could be soft water plug or lower rad. hose

remove coolant.remove thermostat remove bottom radiator hose to water pump.put a empty container under the radiator.take a water hose put it where thermostat goes flush out the rust in block.watch the water as it come out the water pump .if stream water is small keep flushing until you get a study sream of clear water. also flush out radiator. lower water pressure dont flush radiator it with high water pressure you could burst it. make clean the over flow jug .make sure it not stopped up.put in a new thermostat and radiator pressure cap. fill radiator with half antifreeze and half water.bleed the coolant system.

If you are wanting to sell it "AS IS", I would sell it and not put anymore money into it. As far as the overheating, try replacing the thermostat, or the water pump. Do you notice if you have white smoke or drips in the drive way? The smell of something like syrup?

Run the vehicle for about 15 minutes in the driveway and then start looking are the ground under the car for radiator fluid that is leaking. Look around the top of the motor too...paying attention to the large hoses and the sides of the radiator. Watch the water pump area also. If you have a bad water pump...you'll need to replace it.