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Re: The radiator overfow tank is cracked, will that cause...
Not right away but it will cause you to lose coolant and the low coolant will cause you to over heat. It's a dealer part but you can probably get one from an auto salvage yard at a resonable price.
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Wait a minute. In your other duplicate question you did not say the tank was cracked, right ? If the tank will not hold coolant, it will leak out and not be able to refill the radiator when it cools down.
Likely the cause is the opposite of what you are thinking. Oil in the radiator (engine oil) is caused by a blown cylinder head gasket. When that gasket fails it can overpressurize the cooling system by permitting compression from the pistons to enter. (cooling system pressure rarely is above 20psi...compression pressure is more like 150psi. That will cause the radiator tank to burst)
Overheating is not always caused by a bad water pump or bad engine firing timing.
The most common causes are:
faulty radiator cap: steam/water will be escaping from the caps when engine is hot or oveflow tank overflows or empty!
crack cylinder head gasket: check when engine is cold thru radiator cap hole for milky oil in water radiator or large bubbles in radiator water after starting engine. Also check if water steam comes out of exhaust.
cylinder head itself: same symtoms as for gasket above.
if the radiator is cracked, do not drive it. you stand the risk of overheating and doing severe engine damage. take this to a radiator shop. there they can do the repair by removing the radiator and repairing or replacing the tanks on the radiator and boiling out the core and then resealing adn reinstall. its like getting a new radiaitor at half the cost.
I doubt you can actually fix it "yourself", but you can save lots of money by taking it to a radiator shop instead of buying a used or new radiator. They can replace the plastic tank for the bad side, but it is usually the drivers side because this is where the hottest water exits the engine and causes the plastic to crack. I removed the radiator myself and took mine to a shop and they repaired it for $40........cannot repair yourself because the tank has to be crimped on!!!! And radiator "stop leak" products will not work because they are for metal tanks!!!
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