Question about 1997 Chevrolet Monte Carlo

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Coolant leaking into the engine oil. I'm guessing

Coolant leaking into the engine oil. I'm guessing new head gasket but have seen that it could be the oil cooler. Where should I start and how would I know its the oil cooler?

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Hi there, your in the right track about your guesses, better start small. Start with the oil cooler. I not very familiar with the monte carlo but if it has 2 coolant hoses one for input and the other one is output. Change your oil , then remove the two hoses from the oil cooler and plug-off the hoses temporarily( I use a rounded wood). You must secure the hoses to avoid leaking or bursting that why I use wood to plug the hoses(tight fit) then secure them with hose clamps. Next is to start the engine and wait until it warms up and let it run for a while. Well if find no coolant in your oil then surely your oil cooler is at fault. 

But then again, I don't know the leak rate of your coolant in your engine. If you tried removing the radiator cap and run the car a while and theres no coolant leaking then we are talking about a small fissure, but if your coolant still leaks in then its a big crack.

Hope this helps.

Posted on Sep 29, 2009

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Its more than likely either your head gasket or intake gasket. You either have the 3.4 or 3.8 engine and they are well known for these to leak.

Posted on Sep 29, 2009

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... sorry ...

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If it is dump there is leak from heater core. Also open engine block
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Please kindly let me know if the information was usefull for you or you need more info
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