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    Turbod250's Avatar
    Turbod250 Posts: 1, Reputation: 1
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    #1

    Nov 4, 2010, 05:55 PM
    Mystery coolant leak!
    2004 F250 diesel, owned since new, never beat on, but every once in awhile I wake up to a decent amount of coolant on the ground. I have looked every where for a leak but to no-avail nothing turns up. Any help would be great!
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    Nov 4, 2010, 06:02 PM

    Attach a cooling system pressure tester to the radiator, if necessary, to help locate leaks. Pressurize to 16 psi.

    There may be a pin size leak (e.g. with a radiator hose) that opens up and leaks coolant, under pressure. When the system cools down, the leaking stops.
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