Question about 2000 Mercury Mystique

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What is the small hose that comes out the back of the radiator reservoir and where does it connect to on the engine? I have a 2000 mercury mystigue with over 176,000 miles on it - great shape - impecable maintenance but now a horrible sound from the engine - looked under the hood and found an extension off the back of the radiator resevoir pointing toward the back of the engine that definitely had a hose on it at one time - small diameter.

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  • boo_allen Jun 02, 2010

    the sound is like metal on metal from the engine - I change the oil every three thousand miles religiously... very worrisome! will have to drop it off at the shop - thank you for explaining what the outlet was on the radiator reservoir. now I'm just worried that something is really wrong with the engine.



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  • Mercury Master
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The hose is just the over flow hose and it drains the excess coolant when it's over filled when the coolant expands. As for the sound, what does it sound like and where is the general area is it coming from, keep me posted. Be glad to help you get your car running 100% again soon.
Thank you for using fixya.

Posted on Jun 02, 2010

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  • Harvey N Tawatao
    Harvey N Tawatao Jun 02, 2010

    Metal to metal sound when the engine is running at idle without any signs of engine issues is most likely a heat shield that has corroded and is loose. You can take it to a Muffler shop and have them inspect the heat shield and most Muffler shop will do an inspection for free and cam tighten up any looses heat shield that may have gone loose.

    Thank you once again for using fixya and be safe.



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