Question about 1997 Chevrolet Lumina

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Coolant ihas oil in it - 1997 Chevrolet Lumina

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Posted on Nov 09, 2012

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Engine oil mixing into coolant


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.

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97 mercury mountaineering has oil in the radiator and coulant. Help please!


OK, lets figure out what's happening here. You are seeing "oil" in the radiator and coolant. Chances are it is not engine oil. The inly way engine oil can get into a radiator would be if a head gasket was blown. Even then, oil at those locations is not under as much pressure as the coolant is, so when a head gasket blows, what usually happens id that the coolant ends up in the motor oil and oil pan. Verify this by looking at the dipstick to see if it is extremely full. The oil could look like choclate milk. Also, open the oil filler cap and look for signs of chocolate brown goop. I'm betting you won't find that. This is good, but also bad. What you probably have in you coolant is transmission fluid. The transmission oil is circulated through a cooler located inside the radiator. If this cracks or breaks the transmission oil can leak into the coolant. However, at different times the transmission oil and the coolant are at odd with one another pressure-wise. This means that if you have transmission oil in the coolant, you probably have coolant in the transmission oil. This is very very bad, You will need to have the transmission serviced and possible overhauled to repair the damage. You will also need to flush the trans oil from the coolant system. This will require you to replace the radiator, ALL HOSES as well. Coolant hoses do not play well with transmission fluid . The inside of the hose sort of melts and gets real soft and gooey. Changing the hoses and radiator and flushing the motor should work once the transmissionhas been serviced.

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Quit shifting


Could you please smell the transmission fluid sound like the clutches are burnt in the G/Box. If the oil i
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Mar 16, 2013 | 1999 Plymouth Grand Voyager

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No oil in, no good quality of oil used and damaged the friction surfaces

Sep 15, 2012 | 1999 GMC Jimmy

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99 MALIBU HAS OIL IN THE COOLANT RESEVOUR


this oil is usually from the trans cooler in the rad that helps keep the trans fluid at operating temperature by the engine coolant absorbing the heat from the trans fluid .the cooler is a steel tubing in the rad tanks that the engine coolant runs around and absorbs the heat.when the cooler rusts through the trans oil seeps into the coolant.if it was motor oil it could be caused by a head gasket were the oil passage is next to the coolant passage in the gasket and it seeps into the coolant passage.however the coolant pressure is alot higher than the oil pressure and the coolant usually enters the crankcase.

Oct 19, 2011 | 1996 Buick Century

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I have a 2001 Ford windstar, I was told while having my oil changed that there was oil in my coolant, yet when my we removed the coolant from the reservoir and waited for it to separate it never did, which...


In my opinion, if you drained the coolant and there was NO OIL in it or any evidence ( an oily film in the reservoir), you were the poor victim of a dishonest oil change facility.

Just watch your coolant and oil level daily for the next week or so. If any milky residue appears on the inside of the cap where you add oil, or any oil film builds up on the coolant reservoir, then you might have a problem. Most likely a head gasket has failed.

when oil mixes with coolant it sill stay suspended for a long time. Water and oil don't mix but coolant and oil will due to the chemical properties of the coolant and it can take days to seperate.

Sep 23, 2011 | 2001 Ford Windstar

1 Answer

Car overheated once. added more coolant. Now coolant level goes down gradually from time to time, but engine oil seems to be rising. no coolant on the ground that I can tell. whats the problem?


have you noticed some coolant in your engine oil? it will make some bubbles/foam in your oil. If so, the engine head might be cracked and your coolant is mixing with your engine oil. That would explain the reason why your coolant goes down and your oil level goes up.

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Transmission fluid level need regular top up and there is no external leak.Fluid color looks white.


If no external leak and the transmission fluid colour looks white, the problem belongs to the automatic gearbox oil cooler. The oil cooler has broke mixing the gearbox oil and coolant causing this milkshake. It's a small radiator core type oil / water heat exchanger. It is cracked inside and transmission oil is mixed with engine coolant. Because the transmission oil pressure is greater than engine coolant pressure, the transmission fluid level drops. See also the coolant colour inside recovery coolant reservoir inder bonnet! It could be like this:

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The automatic gearbox oil cooler type oil / water heat exchanger (oil cooler):

138b4e6.jpg
(In the picture above the transmission oil pan was removed for oil filter replacement).

Oct 29, 2010 | 2005 Audi A4

2 Answers

Where is coolant temp sensor located


Not sure of your engine size so please pick the appropriate diagram:


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