2002 Pontiac aztek is overheating i have replaced water pump and thermostat. Fixed problem for roughly 3 weeks and now its over heating again. What would be the next thing to look at or do to try and resolve this issue??

SOURCE: overheating but thermostat already replaced

http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?chapterTitle=Water+Pump&partName=Engine+Cooling&pageId=0900c1528024330d&partId=0900c152802432ef#hd1-1-1

good luck replace the thermostat also while you have the coolant out here is a link for that

http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?chapterTitle=Thermostat&partName=Engine+Cooling&pageId=0900c15280243304&partId=0900c152802432ef

SOURCE: Bublling in the thermostat housing and very hot upper radiator hose

I recommend flushing the radiator thoroughly if not done recently. there seems to be some sort of blockage in the radiator at this time. if you get lots of metal fragments that are flushed out during this flush, i will then recommend a rebuild on the radiator or replacement of the radiator. make sure the cooling fans are cycling on time as well.

SOURCE: Overheating engine

Check your oil dipstick for coolant, or a mucky substance. Your symptoms sound like a blown head gasket.

SOURCE: 2001 Pontiac Aztek is overheating. I put in a new

it could be the radiator isn't working properly, I had that problem with my Dodge truck and even though my radiator had been replaced two years earlier when I took it to a radiator shop I discovered it was bad and that was the problem the whole time.

SOURCE: 2005 Dodge caravan is overheating, but there is no

Overheating can be caused through a lot of things But 1st on the heater pipe going into the cab ,through the firewall there is 2 heater pipes 1of them has a air valve on it so when you turn to hot the vacuum opens the valve and lets the hot water come through.or it could be under the dash on inside of firewall by heater inlet.BUT check your radiator for dust and dirt in the outer cores/Loose fan balt/water pump falty/Head gasket leaking/ plus others will all cause
the car to overheat .
So let me know how you get on Ron