Question about 2000 Lincoln Navigator

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Overheating, milky oil, oil in coolant...Please help!

Coolant is leaking near rear of vehicle and oil is in the coolant reservoir. Oil is constantly leaking out and over heats within 15 minutes.

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Well, the good news is this could be something as simple as a blown head gasket. The bad news is most likely that is not the case. You have either cracked your block, cracked the head, worn a hole in your timing chain cover that is allowing the water and oil to mix or blown your head gasket or a combination of these problems. Your choices are to pull everything apart and magna Flux the Engine block and heads or replace the motor, assuming the issue isn't a hole worn in the timing chain cover, or replacing the motor, the easiest of the solutions although not the cheapest. A decent short block should run around $600 to $1000 with shipping. It's used but has been checked and should serve you for a while. The other option is rebuilding the motor. Should you choose to rebuild the motor I recommend you get the Haynes or Chilton's repair manual on your vehicle for doing the job.

Posted on Aug 02, 2010

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Can someone please help, how do I chance the valve cover on a Lincoln Navigatior 1999 5.4 l?

Posted on Mar 25, 2011

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Sounds like you have a bad head gasket

Posted on Aug 02, 2010

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Posted on Jan 02, 2017

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1 Answer

What to do when 2006 Chrysler Pacifica engine temp warning light comes on?


Do not continue to operate. Operating an overheated engine will cause the engine to fail.

After the engine has cooled,
Confirm that the engine has coolant.
Confirm that the reservoir is full to the mark
Start engine and confirm as engine gets warm cooling fan at radiator turns on

Confirm that the rubber engine belt is working
Put in car heater to full hot and blower on.
Confirm heat is hot from car heater.
If heater is not hot possible water pump failure or air in coolant system keeping the coolant from circulating.
Allow to cool completely.
Remove cap start engine and observe coolant flowing at or near cap. Observe bubbling or exhaust gases coming from radiator

Check for water in oil by pulling dip stick
  • White smoke from the exhaust pipe
  • Overheating engine
  • Bubbles in the radiator or coolant overflow tank
  • White milky oil
  • Significant loss of coolant with no visible leaks
If milky likely a blown head gasket

Hope this helps?
headgasket001-hioxyjzsrsihrx1txyibv0ns-4-2.jpg

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2004 Chrysler pacifica has milky brown liquid in the reservoir and the oil stick looks good. None on the stick and just change the radiator.


The milky brown liquid floating at the top of your coolant reservoir is almost certainly OIL. This is usually a first indication of a head gasket issue, especially if your vehicle has recently overheated.

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You may have a blown engine head gasket. Check your oil to see if it is milky because water is getting into the oil, and check the water to see if oil is getting into the coolant.
If you have either of these, you may need to have a new head gasket for the engine, and hopefully you do not have a cracked engine head.
This will require a fair bit of work to fix correctly. Your local garage or mechanic may be your next call.
There are some products you can use in the coolant for either of these, but it is only a temporary fix.

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Water was found leaking from my oil pan and car is overheating. I have a 95 Mazda MX3


Is it leaking FROM the oil pan, or dripping OFF the oil pan?

If its dripping OFF the oil pan, that leads me to beleive you have a coolant leak somewhere. Check the coolant level. Check for leaks.

Check your oil, if the oil is milky/coffee colored. Or if your coolant looks kinda nasty, you may be looking at a headgasket.

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Have very slow water leak.. can not find where it is leaking at . checked oil and it looks milky


milky oil would suggest water has mixed in with it. this added to a slow, unfound water leak points toward a head gasket problem with the coolant escaping from the cooling system, into the oil.
this needs to be sorted out fairly quickly. apart from the obvious problems of a water leak and the risk of overheating, oil with water in it will not lubricate the engine properly and there is a serious risk of engine seizure.
a garage should be able to do a simple test on the oil to discover if it is coolant contaminating the oil.
a pressure test on the cooling system would also confirm where the coolant is being lost.

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My husband and I have mystery chronic overheating in our 96 Isuzu Trooper. The woman who sold it to us had a new radiator installed just prior to us buying the vehicle. Since then, we've installed a new...


ouch. leaking fluid and no signs of leak. check engine oil. if it appears milky, you are leaking into the cylinders. this means you'll need a new head gasket.

Sep 18, 2010 | 1995 Isuzu Trooper

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THE COOLANT ISN READING 210 AND THE CAR STATED SLOWING DOWN ON ME. WHE N I TURN IT BACK ON IT MAKES A RATTLING NOISE


with the car cold for a few hours, take off the cap on the coolant tank and look at it, it should be clean and red. If it's not, or looks 'oil slicky' you may have a coolant leak into your oil. You can also drain the oil to see this, the oil should look like regular black oil, if it's bubbly, foamy or even light tan/brown you most likely have a blown head gasket or upper intake gasket.

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