ok so about a couple months my camaro (97 3.8 3800 series 2) i blew a head gasket and hydrolocked the motor so me and my buddies ripped it all apart replaced the bent push rods and headgaskets, new radiator old one cracked whitch caused the gaskets to blow and a new thermostat we got it all together and it ran good for a while till about a week ago on a trip it started to get fast so i pulled over and sht the engine off opend the hood upper radiator hose blew so i cut the end off that blew put it back on and drove for about half a mile and it started getting hot again so i took off the thermostat housing the thermostat was stuck closed so i took it out and ran it without the thermostat so i could make it to my friends house i got there and it seems like the coolant isnt circulating through the engine the upper hose is really hard while the engine is running whitch i think the hose blew but without the thermostat it should be fine so idk whats goin on also the water was brown when i popped the radiator cap off like its rusting whitch idk cause im running 50/50 coolant in there any one can help also cylinder 3 has a slight missfire that i cant figure out for the life of me i have brand new plugs and wires so im not suretheir gapped correctly and injector are working any help appreciated thanks.

 

Could be many things, water pump failed, low coolant, head gasket may have blown again. Were the heads resurfaced before replacing the gasket? Usually gaskets blow because the heads warped due to overheating or improper tightening.

 

I would check for "mud"...my 3800 camaro had it really bad, either from straight neglect to servicing with the wrong type of coolant. My car had overheating problems until I cleaned it out. Probably would be a good time to change the water pump since this will reveal mud problems as well. It's cheap ($33 for a NEW water pump) and relatively easy job. If you have mud, get some of the radiator "super cleaner" (not the flush, the more powerful stuff - White Zerex bottle with red label) and run it through your car a couple of times to clean it out.

You can also check to see how well your water pump is working by filling your car with water (no antifreeze), removing the thermostat, and unhooking the top radiator hose. Start the car and if the water pump is working it will blast out the top hose. Obviously don't run it like this for very long since you'd be losing coolant very rapidly.

After the super cleaner, I would refill it with universal extended life coolant found in the auto parts store, NOT the Dexcool it came with from the factory. As long as you flush out all of the old stuff, the car won't have a problem with the different coolant.

Also make sure your cooling fans are working and that the air scoop under your front bumper is still intact, as this directs air into your radiator and the car WILL overheat without it.