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I'm having problem oil leaking and coolant

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  • Jeremy W.
    Jeremy W. Apr 30, 2013

    year, make model, engine size?



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  • Cars & Trucks Master
  • 3,799 Answers

Replace the head gasket!

Posted on Apr 30, 2013


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Posted on Jan 02, 2017

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SOURCE: I am leaking coolant from

First, I am assuming that your vehicle is equipped with the 3.1L V-6 and NOT the 3.8L V-6? (Engine size is really nice to know in situations like this!)

It could be any where in the cooling system. The intake gaskets also like to leak externally. A bad intake gasket does not always mix antifreeze with the oil. Take a flashlight and look for coolant on top and/or down each side of the transmission bell housing. This is VERY common on these engines. It may be leaking just enough to where the exhaust crossover pipe is burning it up (and stinking) before it has a chance to run on the ground. Also look for stains on the intake manifold-to block mating surfaces and on the side of the bell housing that will indicate a leak. if your vehicle is still using Dex-Cool, the stains will be pink. If your coolant has been changed to green antifreeze, the stains will usually be real white or dark green depending on the brand and the severity of the leak.

If there are no leaks or stains in this area, then look around the water pump area for the same things. The radiator or coolant hoses (including heater hoses) could also be leaking. If it is stinking when the engine is hot, then you could get it hot then shut if off and look for steam.

TIP: A bright LED flashlight works really good for locating steam.

Posted on Jun 18, 2011

  • 5763 Answers

SOURCE: 95 Lumina 3.4 DOHC, 137k.

The first thing is to locate the coolant leak, you will need to pressurize the cooling system to locate the leak. these cars are famous for intake leaks, coolant and oil so take a good look at the intake where it meets the head, if theres coolant getting into the cylinder that may be the cause of the misfire. good day.

Posted on Jun 19, 2011

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The loss of coolant I assume only happens when the engine is at running temperature and therefore when it us under pressure and also hot. These type of leaks can be hard to spot as the they can be very small and as the water emerges it evaporates immediately so there are no tell-tale drips or stains. My first checks would be the coolant reservoir cap and the drain **** on the radiator. Make sure that rubber seal on the cap is not cracked and is seating correctly, a light smear of silicone grease may help. With the drain **** on the radiator there is often a rubber sealing 'O' ring, make sure this has not cracked or become dislodged (can sometimes happen when draining coolant - I have done this myself and it took me quite a while to track down the resultant leak). Again a light smear with silicone grease on the 'o' ring can help with the sealing. If these two checks show no problem then have the coolant system pressure tested at a garage. This will simulate the kind of pressure that the coolant is under when the engine is at operating temperature but since it is still cold the leak will result in obvious drips. If no drips are obvious then remove the spark plugs one at a time and check their relative condition. If you have a gasket leak into a cylinder the relevant spark plug will often look cleaner than the others as it has been effectively 'steam cleaned' during combustion. Next check your oil cap and oil levels. It may happen that a leak at the cylinder head gasket allows coolant into the oil passage ways. A thick mayonnaise of oil emulsion on the inside of oil filler cap is one indication of a leak via the gasket. If you have a gasket leak then this requires the cylinder head to be removed and for a new gasket to be installed. Hope that all helps

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The first thing is to locate the coolant leak, you will need to pressurize the cooling system to locate the leak. these cars are famous for intake leaks, coolant and oil so take a good look at the intake where it meets the head, if theres coolant getting into the cylinder that may be the cause of the misfire. good day.

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