Check to see if your engine is leaking oil and/or coolant. This causes your engine to overheat and if it's not fixed, it can cause it to freeze up. Check your oil and antifreeze for contamination. If your oil or antifreeze looks different in any way, have it tested by a lab to determine if contamination has occurred. Check the level of fluid in your radiator. If your car suddenly loses a lot of coolant or the level is very low, this can indicate a cracked block. Look for excessive smoke coming out of the exhaust pipe. Check the radiator's coolant mixture of antifreeze and water to determine if it has frozen. Check to see if the engine has overheated severely. Overheating can be caused by another engine problem, but the effect of the overheating can be a cracked block.
Check your oil for signs of coolant,look for white smoke coming out the tailpipe,or get the engine pressure tested.Plugs may also get a sludge buildup sometimes.The Cavalier does have a reputation for bad blocks I'm afraid.Best of luck to you.
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