2001 Pontiac grand am overheating problem. I have done new head gaskets new intake gaskets, new water pump, new thermostat, new radiator, new reservoir w/ cap. system has no leaks pressurized for 2.5 hrs at 11 psi back flushed 2x, still over heating still over pressurizing and blowing out reservoir any one have any ideas on what to do im puzzled by it!!

SOURCE: 2000 Sunfire coolant problem. Engine overheating,

ok, its time for a radiator flush. there is major sludge in the internals of this radiator. Make sure the thermostat is in the correct position as well. I've seen many cars come into my shop with the thermostat inserted backwards.

Luis Rondon

• 56 Answers
• Posted on Nov 19, 2008

SOURCE: 1999 Pontiac Grand Am Overheating

It is probably the problem. To make shure that need to change the gaskets, one of the symptoms use to be thet the temp rises when you are running at speed 50+ average, where is supposed that the car gets a lot of air due by the speed and nobody thinks that will be overheated.

SOURCE: I have a 1993 Lexus ES 300 that has overheated and

Bad news, I had this happen once to my daughters Volkswagen Jetta, I replaced the head gasket and had the same symptoms you describe. i wound up having to take the head back off and took the gasket back to where I bought it and compared it to a new one and discovered that the holes in the one I had put on didn't match up with the new head gasket. The auto parts store gave me the new Head gasket at no charge because the other one was defective.
However hopefully this isn't your problem, it could be something as simple as a defective thermostat that just isn't opening after the engine reaches the correct tenperature. Check this first before tearing back into the engine.

SOURCE: Overheating Fiero

well fieros are very different cars you need to fill collent in a speical way so air doesnt get in the lines most fiero owners do not know this but it very important The best way to tell it is for wikipedia
Cooling system issues
With an already hot normal operating temperature of 220 °F (104 °C) prior to the recall switching to a 195 °F (91 °C) thermostat, the mid-mounted engine utilized long pipes to carry coolant to the front-mounted radiator. This demanded that a special coolant filling procedure be followed to prevent severe overheating. Simply pouring coolant into the thermostat housing (on the engine) would leave an air bubble in the radiator, while adding coolant just to the radiator would leave an air bubble in the engine's coolant passages. Proper procedure (with engine idling and the thermostat removed, filling the thermostat housing, burping the bubble out of the radiator by cracking open the radiator cap until coolant exits) must be followed in order to ensure an air-free cooling system.
A second problem has become common as more Fieros are being serviced by shops unfamiliar with their design. The under-body coolant tubes are positioned in such a way that a casual glance beneath the car will not suggest their fragility. As a result, many have been crushed by shop lifts, resulting in a near complete lack of engine cooling. The age of the car means that even GM dealerships may now be unaware of the proper jacking methods.
Lastly, the absence of a spare tire (at the front of the car, right behind the radiator) could have an effect on coolant system performance. i dont know who wrote this and i dont take credit for it

SOURCE: i have a 99 lincoln continental that is

undo the clip on the highest hot hose and see if you have any air in the system.
from your list of replacements i see you have not replaced the temp sensor for the fans,to test run a hot wire from the battery to the fan,if it runs then you know they work...unless they run when engine is hot anyway.....