Question about 1997 Ford F150 Regular Cab

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My radiator reservoir has oil in it....I just bought this truck yeaterday and realized ....what does this mean ,,,,runs great and no leaks and engine oil reads full and clean looking

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I would take it back where you bought it and show them, but if you bought it at a private sale, your stuck.
Ten to one it's a blown head gasket.

Posted on Jul 14, 2009

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Posted on Jan 02, 2017

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OIL IN COOLANT RESERVOIR 00 CADILLAC DEVILLE


Are you sure its oil? If you bought it used someone probably added Bars Leak or some other cooling system sealer which can appear as oil. Cadillac Northstar engines are well known for cooling system problems, and that is usually the first step people take. If it is oil that could indicate an intake manifold leak or a head gasket leak, although it usually results in coolant in the oil, not the other way around.

Feb 15, 2017 | 2000 Cadillac DeVille

1 Answer

Oil in the radiator overflow reservoir


If it is engine oil, you could have a leaking head gasket or intake gasket. If its trans fluid, you could have a leak inside the radiator.

Oct 18, 2015 | 2003 Saturn VUE

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Oil in coolant reservoir 1995 dodge 5.9 gas no coolant in oil no white smoke


Usually a leaking head gasket if its not transmission fluid.
The gasket can leak oil into the coolant without leaking coolant into the cylinders.
You might also want to check and see if you have an engine oil cooler running thru the radiator.

Aug 07, 2013 | 2000 Dodge Intrepid

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My boyfriend has a 91 Toyota 4runner v6 SR5. He has replaced the radiator and thermostat. Also he has bled the coolant system several times. The truck is still losing coolant. If he drives the truck...


When engine completely cools remove coolant from overflow reservoir to the cold mark on the reservoir which is the lowest mark on reservoir. If you continue to loose coolant you may have busted block.

Aug 04, 2017 | Cars & Trucks

1 Answer

I have a 1998 Saturn. The reservoir often leaks water/antifreeze and light comes on to indicate. I have had water pump as well as reservoir replaced. Doesn't leak everday but still leaks. WHat is this?...


you need to find that leak, is the leak visible? if its not from radiator or the reservoir, the only other place I could think you can lose water is the head gasket. It happens to high miles and hard driver. 100k miles would likely be a head gasket. Leaking head gasket will also cause the engine temperature to rise and run super hot. antifreeze will leak through the head gasket down to your oil pan mixing oil and water. Check your oil by pulling the dip stick and see if you have oil mix with water; it will have a slimy looking colors, oil is light color and it should never be black. if it black than change your oil and inspect it afterward when the car has been running for while. when engine really hot cause the heat to effect the starter not to engage or start or engine is too hot to run. repairing head gasket could run anywere from 500-800 bucks.

Nov 24, 2010 | 1998 Saturn SL

1 Answer

Not holding antifreeze, found puddle of oil and antifreeze under the car. reservoir was empty, added antifreeze to reservoir ....still leaks


You likely will not like my answer but what you need to do is get underneath and actually look very carefully for the source of the leak. There is no place where both coolant and oil can leak at the same time. If you find oil in the radiator or coolant in the engine oil, then you have a bad head gasket. Usually though you would have an overheating problem or steam from the tailpipe and the engine would run poorly if that was the case.
There are numerous points where coolant or oil can leak. The list is too long to write. I'd definitely look at the hoses, radiator and water pump first though as they are the most common places coolant leaks develop. As for the oil leak, check the filter, valve cover and drain plug first, otherwise any place two engine parts are bolted together it's possible to have seepage from a gasket.
If you cannot find the source, any good shop can do a pressure test or dye test to find it for you.

Sep 29, 2010 | 2000 Jeep Grand Cherokee

1 Answer

Loosing coolant from reservoir, dye in coolant did not turn up any leaks, no coolant in oil, what now?


Either the coolant system wasn't truely full. Meaning that after it is filled up while running, the radiator will eventually empty in to the engine block, then you will need to fill it up again. Unless you are burning it up, but since it is not in the oil, then I don't see any worries

Aug 07, 2009 | 2005 Chevrolet TrailBlazer

2 Answers

Water not staying in Radiator


yes, not having an overflow reservoir for your radiator will cause you to lose water. As your engine warms up the water expands and creates pressure in the cooling system. When the pressure reaches a certain point(usually about 15 psi.) the radiator releives the pressure by releasing water into the overflow tank. When the engine cools back down the water shrinks pulling water back into the radiator from the overflow. If there is no overflow, the everytime the engine warms up on a drive water will be lost and not recovered on cooldown.

Jun 04, 2009 | 2000 Hyundai Elantra

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