it is a trailblazer but the engine is what i am concered about..it over heats not sitting dling just going around the block. they have put in a new radiator , a new ecm,three new thermostates, a new water pump new belt, new idler pullys,, the parts cannon. they moved the new collant sensor from the head to the upper radiator hose, and it leaks when it gets hot. how are the steam hoses suppose to be hooked up. i am thinking of buying a haynes manual unless i can get a cheap shop manual. it is a 2004 chev trailblazer, 2wd? 5.3 liter haven't checked for craked heads yet.. need to buy a rubber glove.

 

How is your cooling system being filled? Try to VACUUM fill the cooling system. Check the heater core inlet and outlet to make sure it’s not clogged, make sure none of your coolant galleries or hoses are clogged (stop leak, buildup). Also try to use GM original coolant and get the concentrate, mix it with distilled water. 50/50