You have an over heat problem. Check the radiator cap for correct operation. have a cooling pressure test done for cracked head / gasket. Do a compression test done for head gasket failure.
SOURCE: engine coolant
it is a improper connection is somewhere inside..
when the cap is opened the liquid does overflow at once ...there is not problem in the engine..
check the connections
SOURCE: Overheating I having to put coolant in every 3 to 4 months
you may have a head gasket that is leaking coolant into the cylinder. That would explain the reason why you can't find a leak, it is going into the engine and out the exhaust. Check your oil after running the engine for a few minutes to see if it looks milky or cloudy grayish look to it. If so, then it is also leaking coolant into the engine block.
SOURCE: 97 cadillac eldorado overflowing through overflow pipe
The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank(not the cap),this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.The hose goes in to the engine to a crossover and comes out the other side to near the thermostat housing,the blockage may be there.
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