I hope I am posting in the right spot. I have a 1997 Eldorado ETC, 108K miles. It had a crack in the radiator upper right side. I replaced the radiator and tstat, but, its still overheating after about 15 miles. I have flushed the block and new radiator, cooling fans work, pass over not plugged. I have run it with and with out tstat. I am at wits end. All I can come up with is the heater core (which shows on signs of leakage)
It has also developed a good miss, I think I need to replace a couple coils, no biggie, unless it is related to this.
Any help or advise is GREATLY appreciated.
Guys, Thank you SO much for the information. By doing the above mentioned tests, it head gasket. Definite exhaust smell in purge tank and small bubbles. I was hoping it was not. I was repairing to sell it, now I will rethink what to do.