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If you are getting oil in the coolant, or coolant in the engine oil, or any obvious external leaks, the block could be cracked. The crack would be bigger when the engine is hot.
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If you are getting compression into the cooling system you either have a blown head gasket, warped or cracked head, or cracked cylinder wall. You need to find a reputable professional to properly diagnose your issue.
If your exhaust smokes white ,which is steam when engine is warm this is a tell tale sign that coolant is leaking into combustion chamber of engine. If you see high level of oil or foam on oil dip stick, this a sign coolant leaking into engine. Either circumstance would mean possible blown head/intake gasket or cracked head or cylinder crack.
You can also have cooling system pressure tested to verify leaking, it is a quick test which is not expensive to have done at a shop.
crack block problem would cause engine overheating problems check radiator see if radiator has a leak could have rust in radiator.check for leaking hoses check water pump see if you wet signs where pump leaking at weep hole. if you suspect crack cylinder head.you need to do a cylinder leak detector test using air pressure looking for stream of bubbles in the radiator.
Cracked head means replace your engine, head gasket if you do it yourself approx $150 , dealership cost $800. Remove the oil cap on the top of the engine block , put your finger in and see what color the oil is if it's dark it's not a cracked head , if it's white and or milky looking, you have water in your oil, cracked head !
Not a good sign, must take your car immediately to check if there is any crack in the engine block, engine head or water ports., water pump assembly.
Sometimes if there is a crack it might be serious as water might seep into the oil and make the lubrication bad resulting in a total packed up engine. Check your oil forr traces of water , if so get help immediately..
That is not a good sign. These are a few ways this can happen. Bad head gasket, bad intake manifold gasket, cracked or warped head, or a cracked engine block. If the intake manifold gasket hasn't been replaced yet, have it checked for leaks. The 3100 and 3400 V6 engines are prone for intake gasket failure.
if oil is leaking from the the top to bottom, check the gasket below the cover that has the daewoo name and sign on on top of the engine block. it could be cracked. replace with new one without any gasket sealant just replace the original and done
is your check engine light ON? Has your timing belt been changed? have your intake cleaned, including the IAC valve. Inspect your intake hose for crackes and leaks(this is very typical. If your intake hose is cracked or leaking, this will cause hesitation and rough idling/running. post comments or questions...hopefully this helps
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