grand prix overheating

[wantabe]

i am at witts end with this car i have the 3.1 3100 just replaced the water pump, thermostat. heater core and i replaced the intake gaskets twice and this thing still wants to get hot gets hot then rods start chattering then it dies i can not figure this thing out

[tblake]

Has the cooling system been flushed? Is there air in the cooling system that needs to be blead out? Is the head gasket blown? (stupid question) but is the t-stat in in the correct direction? Do the cooling fans turn on?

[grandprixgtx00]

yeah, i would say head gasket. 3100's are known for em'.

[CrazyHorst]

It also sounds to me like you have blown out a headgasket from the combustion chamber into the water jacket.

This will boil the coolant internally (~800 psi peak cylinder pressure vs. 50 psi maximum pressure in the water jacket).

Also keep in mind a 3100 has iron block and aluminum heads which tend to "scrub" the head gasket into failure (over a long period of time) due to the different expansion rates of the metals.

[richtazz]

I'll add myself to the list of people that believe you have a blown head gasket.

[wantabe]

ok guys thanks alot looks like a tear down is the ticket thanks again