QuestionI have a 99 cadi deville. My issue is my coolant system is pushing antifreeze back to my reservoir nd it iscome out of the overflow. I have replaced cap nd thermostat wat else could be my problem other than maybe a blocked hose. Once is dispenses the fluid then will start to overheat.
AnswerHello,
Head gaskets? This aluminum engine cannot be overheated a little bit. With 50/50 anti freeze if you run the engine at 225 degrees, your engine is melting! Even the 225 degrees is pushing it. These engines are not available in a junk yard either, because they are all overheated junk!
You could have a hole in a cylinder wall and that would give you the same issue. Everyone thinks they can correct the overheating by changing the thermostat and up to this point, everyone has been wrong.
Radiator could be plugged, cooling system circulation problem, fans not working and more. These engines are great for performance and economy, but their Achilles heel is over heating.
Many people think they have a cast iron engine where they can run this engine hot until they get some place safe. If you do not shut it off immediately with the hot light on (usually too late) or when the engine is getting in the 220s, catastrophic damage is going on!
Also be aware, head gaskets are not the cause of overheating this engine, but the result and will set you back $1,500.00 plus. A GM crate engine is $4K plus change.
Look at my archives f people that have met the same peril as you.
http://www.autotheftexpert.com
