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  1. I have. 1994 DeVille Concours and it recently turned 132,000 miles. I heard a clicking coming from the Idle air Control Valve after replacing it. I couldn't stop it so I decided to support my local dealer and dropped it off. They fixed the IAC valve and proceeded to flush my power steering system, this is where the trouble begins. I get a call from the dealer and the service advisor tells me he has bad news. "The car seriously overheated he tells me when the car is left idling for a while. I know you won't like this but your car suffered serious damage and may have warped one or both of the cylinder heads when your head gasket blew." He then asks for permission to start disassembling my engine so he can give me an estimate on the fix. I told him "no" , the car is not worth several thousands of dollars worth of work. In the beginning I had mentioned that the car seemed to be running hotter than normal, and what is considered normal? They did not test for carbon monoxide test until after the mechanic had "severely overheated your car". The dealer has decided not to charge me for the diagnostics and the power steering flush. My bill is about $700, why would they be so eager to eat that? The dealer tells me that the car "should" make it home and might be good for A year or two. They said that the blown head gasket isn't bad enough to keep me from driving the car. He suggested that I not drive through any deserts.. In my world a head gasket is either Blown or Not Blown, what is a blown engine to a dealer? 1.What do I do now? 2.Can a head gasket blow allowing combustion gases into the anti-freeze without oil in the antifreeze or antifreeze in the combustion chamber? 3. How bad is this problem? The dealer said I was lucky to go 132k miles without other problems. 4. How do you protect yourself from dealer mistakes? 5. Do I hire a lawyer or what? 6. Is there any fix for this problem? 7. I am a pretty good mechanic and have replaced heads before. Is there a particular place where these engines blow their head gaskets? 8. If I reduce the engine operating temperature by using a good water wetter and maybe a lower thermostat like a 185 and really good coolant. I would also use lower settings for the fan relay driver. 9. Should I try to fix the head gaskets or will they blow again? Any thought or ideas are absolutely welcome. I remember my original dealer telling me that the "Northstar" engines were designed to run hundreds of thousands of miles. As an engineer I believed the baloney as the engine looked good as was strong enough to push my 1994 Seville STS to a 14 second quarter mile. What when wrong? Why doesn't Cadillac protect their image? I bought the STS first and the DeVille second, they are both Northstars What do I do? Help me please!