Re: Coolant leaking into the engine oil. I'm guessing
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.
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When the oil was changed, did anyone reset the oil life monitor? It needs to be reset every time an oil change is done. That would explain why it is telling you to change the oil so soon.If you have a bad head gasket, antifreeze mixes with your oil. Check the oil on the dipstick. Does it look normal? Check under the cap where you pour the oil into the engine. Is the oil cap wet on the bottom? If yes, and the oil on the dipstick does not look normal, the head gasket is defective. It most likely would leak where the thermostat is located, since the gasket seal was taken out and replaced with a new one. It may not have been done correctly. There may be a puncture in a hose. There could be a crack in the coolant reservoir tank. The thermostat must be stuck in the open position or the thermostat was installed backwards for it to take that long to heat up. Refill the coolant reservoir tank with antifreeze and water before driving the car to avoid severe engine damage.
The only place, oil and water share a gasket is the cylinder head gasket, oil and water galleries run through the engine block and head via the head gasket. The cylinder pressure will be OK, it's the oil pressure that's putting the oil in the coolant, the gasket has gone between the water and oil galleries or there is an internal crack (unlikely). A coolant pressure test should show it up.
has it been run hot lately?do you have water or coolant in your oil? pull the engine dipstick to see. do you have oil in the radiator? do you see coolant coming from the exhaust? these are all signs of blown head gasket. unexplained useage of coolant with no apparent signs of leakage usually means that coolants going trough the engine and out the exhaust system.smell bad when idleing in enclosed space? unexplained smoke coming from tailpipe when weathers warm? water residue dripping from tailpipe after the engines warm? i've given you most of the signs of a blown head gasket,which is what you requested, using alot of water with no sign of leakage. if no water in the oil,no oil in the water, then the leaks into the exhaust and out the tail pipe. you can do this, remove the ant-freeze from engine, then apply nanno technology[auto zone] water only added to engine. follow directions on 1quart bottle. this has worked for me several times.[for blown head gaskets that leak into exhaust] it's new technology that's new to the automotive industry. 1 quart costs $20.00 considering how much it costs to replace a blown head gasket that's only leaking into the exhaust sysytem,that's worth a gamble l to me. i've seen it work myself.
Your head gasket is a gasket ( usually 3 layers of metal and synthetic material) that is betwen the head and the block.
It keeps different systems in your engine seperated.
When it "blows" it's mean that it is ruptured and allowing one system to interfer with another i.e: Coolant system with oil ot oil with combustion or coolant with combustion.
Most common is coolant with combustion is which you coolant (antifreeze) leaks into a cylinder and burns with the gasoline when the engine is runng.
This is commonly seen as a thick oily white smoke coming out the exhaust with a definate smell
Replacing a head gasket is not a job for an inexperianced person. It involves removing the upper portion of the engine, eplacing the gasket and reassembling it.
A head gasket leak (blown head gasket) is highly likely. ($200)
Check your oil dipstick If it contains a milky fluid, that is water mixed with the oil. A sure sign of a blown head gasket.
Other symptoms of a blown head gasket include:
1. White smoke and excess water dripping out the tailpipe.
2. Overheatinmg engine
3. With radiator cap off, steam and water will erupt, sometimes violently.
Whichever tailpipe has the smoke is the side that the blown head gasket is located.
Check the oil for traces of coolant (oil will be milky in color) and oil cap too. If oil has coolant in it head gaskete needs to be replaced. Also check the floor inside the cabine (espetially passenger side)
If it is dump there is leak from heater core. Also open engine block
Coolant might spray onto hot engine and evaporate.
Please kindly let me know if the information was usefull for you or you need more info
OK this can be 2 things. Either a blown head gasket which can produce oil in your coolant and over heats the engine. The 2nd is less likely and that is that your radiator and oilcooler both are leaking.
My guess is the head gasket. Good luck this will cost you quite a bit.