mostfocused Posted October 16, 2014 Report Share Posted October 16, 2014 I recently purchased a 1999 Cadillac Seville SLS. The car has only 67000 miles on it and it appears to have been babied because there is nearly no wear inside or out. The car drove beautifully for the first day or two and I became an instant Caddy lover...THEN, while on a longer local trip, I realized that the engine was running hot. Here are the facts as I know them: There is no smoke coming from the tailpipe The engine idles smoothly and does not run rough at any time The engine only runs hot when I am traveling up and down hills or if I am on the expressway above 60 miles per hour There is no sweet smell from the exhaust There is no indication of coolant in the oil There is no indication of oil in the coolant The car passed an emissions test (while owned by me) where they test admissions via the DLC port The car goes through coolant pretty quickly once it gets hot (over the 5/8 temperature gauge range) I have ran the car hot to the point where I receive the "idle engine" message and had to pull over and wait 5 minutes for the car to cool down Once the car cooled down (next morning) I saw signs of a small amount of coolant leaking down into the engine compartment. Since it took approximately 1/2 of a gallon of coolant to replenish and refill the reservoir, it would seem as if the coolant is evaporating. I have read all of the forums and talked to a number of different people, and it seems like the default cause is the notorious head bolt related head gasket failure. However, I this is my first Cadillac, and I am having a very difficult time believing such a well taken care of vehicle can have a head gasket failure if it doesn't it exhibit all of the signs consistent with a head gasket failure. I am sincerely hoping that it is a much smaller and less expensive issue that needs to be addressed. Based on all I have read, if I do have a head gasket failure, it would appear to be the type that causes exhaust gases to enter the cooling system. Please let me know how likely this is given the age and condition of the vehicle, and what I can do to ensure that I don't spend unnecessary money on a head gasket repair. Thanks in advance! Quote Link to comment Share on other sites More sharing options...
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