I have a problem with my 1997 cadillac seville SLS. I have replaced the thermostat, water pump, heater coil, and flush the radiator out and the engine is still running hot. The antifreeze is boiling back out of the overflow hose. There is no lost of power.

 

In a 14 year old Northstar I honestly suspect a leaking Head Gasket taking into account all of the other things you have attended to. How many miles on this engine ? Generally the engine runs fine with lots of power which is why this problem is such a nuisance, then it gets too hot pretty quick and you are stuck. The repair if done right is $2700 or so.

 

My daughter recently overheated my 1994 SLS. Took out the front headgasket. Coolant in 2 out of 8 cylinders. Anyone know the odds that the head is warped or cracked. Or is there a chance of getting out of this by doing a headgasket

 

Check for oil / coolant cross contamination, is the most typical. Coolant in the oil, coolant in the cylinder.

 

Looking for a heater hose diagram for my 97 DeVille.

Looking to see where the hose connects heater core to pump.