1990 7.3L Diesel-Coolant Disappearing

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dumbneasy - 13 Aug 2008 01:38 GMT

Somewhere along the line my 3 gallons of coolant keeps disappearing. There
are no drips or puddles. There's nothing in the oil pan. There's no
misfirings and the engine runs smoothly. There's no overheating. So where
is is disappearing to? Does anyone have any ideas?

Thanks

Steve in Lincoln, MT.

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Nate Nagel - 13 Aug 2008 01:47 GMT

> Somewhere along the line my 3 gallons of coolant keeps disappearing. There
> are no drips or puddles. There's nothing in the oil pan. There's no
[quoted text clipped - 4 lines]
>
> Steve in Lincoln, MT.

Checked for combustion gases in the coolant? not familiar with your
particular engine but "mystery" coolant disappearances are often head
gasket leaks between a cylinder and the cooling passages. If that's the
case, you'll find out soon enough when it gets worse and either starts
blowing steam or hydrolocks.

nate

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George - 18 Aug 2008 14:12 GMT

> Somewhere along the line my 3 gallons of coolant keeps disappearing. There
> are no drips or puddles. There's nothing in the oil pan.

You'd better add oil or else your engine is going to be toast.

Jeff

<...>

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Steve Hartman - 06 Sep 2008 03:32 GMT

And the answer is, I had a bad radiator cap. I was told the way you tell is
look in the radiator after filling. If you see bubbles it's a head gasket.
No bubbles and no apparent leaks replace the cap. I love these $8
repairs....

Thanks all.......

> Somewhere along the line my 3 gallons of coolant keeps disappearing.
> There are no drips or puddles. There's nothing in the oil pan. There's
[quoted text clipped - 4 lines]
>
> Steve in Lincoln, MT.

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