a couple of time when i ran the heater, the warning light said engine coolant hot. It doesn't do it all the time. I have notice that when i look at the coolant overflow tank, sometime the coolant will have came out from the top cap where you fill it up at. Can someone tell me what cause this please. I am scared to run my heat and december is near.
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Hello Meana:
Your problem could be complex or quite simple depending on the diagnosis. What year is your Cadillac? If it is 1995 or earlier you will be able to find out the problem through your onboard diagnostics system which will provide error codes to troubleshoot your problem. If you own a later model (1996 to present models) then you will need to have an ASE mechanic to diagnose your codes.
If coolant is escaping through your overflow tank cap, then that means that it is bad and needs to be replaced. The primary purpose of this cap is to maintain even pressure in the coolant system. Without complete, even pressure, then the system will fail at other points. If you have a Northstar (NS) engine, then it is in your best interest to resolve your problem at the soonest possible time. Once your NS overheats then a multitude of problems could, and all of them are expensive, including the possibility of blowing your engine (head gaskets) which might then be necessary to replace your engine.
On the other hand, a new cap might solve all of your problems, and it does not cost much to replace. Purchase one soon. I hope this helps.
Peace,
Famous