Question about 1999 Ford Taurus

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Fos the past five months unexplained coolant leak....Had pressure test twice, no white smoke from tailpipe,spark plugs look fine, never any spots under the car. It runs great. We decided to check the oil again for coolant and it was thick and black even though it had only been 2000 miles since last change.Also replaced the resevoir and had cap replaced.HELP!!!!

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  • angelunaware Apr 20, 2009

    I honestly do not know what you are talking about.....I appreciate your help very much. This is the first time I have posted a comment. We are at our wits end trying to figure out what to do next. I failed to mention the heater core is fine. I would never be rude to anyone who was trying to help!

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  • Ford Master
  • 6,982 Answers

Thick black oil generally does not indicate coolant in oil...that appears as coffee coloured residue with a milkshake thickness to it. But, I'd let the car stand overnight and then drain oil. coolant will stay at the bottom of the pan and exit first, so watch carefully.
Next, have a shop dye check for leaks...often small leaks are in the form of seepage that is light enough to evaporate on the hot engine before reaching the ground. Another test you can do is to let it sit overnight with the radiator cap off. Sometimes a water pump seal will only leak when not under pressure. (like when you try to empty a can of dog food...punch a hole in the bottom of the can and it will fall right out!) Also, check the rug inside the car...any dampness indicates a leaking heater core.
I hope at least one item here will help. Obviously if you are loosing coolant, it has to be going somewhere. PS: use a good grade of synthetic oil and it should not break down as quickly as what you are using (regardless of if contaminated or not)

Posted on Apr 20, 2009

  • Richard Scordino Apr 20, 2009

    I listed every test I would actually do if I had your car in my shop. (except for a hydrocarbon test of radiator) which I do as routine.

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