hey i have a problem with heat when my car is just siting it will keep a steady temp around 180-185 and it will sit there at idle like that for 30 minuets but as soon as i take it down the street the temp rises like no other and starts spewing fluid like crazy any ideas on what is goin on ?

 

sounds like a blown head gasket or a crack somewhere. u need to make sure its not air in the system first. did u bleed the air out? theres a couple screws that u open to bleed. one on the thermostat cover housing and one on the hose by the alt should be one at the bottom area of the tb. if its still acting up after that do a pressure test on the cooling system. are u losing water? or can u tell. pressure test should let u see were the water is going if ur loseing it. i am assuming u have a 95 lt1.

 

A good way to check if its your head gasket is when the radiator cap is off and the car is running make sure gas fumes arent coming out of the radiator... its probably the problem I had and you have a split or leak in the radiator even if the core of the radiator is fine it could be a split in the plastic causing it to overheat

 

your cooling system could need a good flushing also