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Check the lower radiator hose temp. sensor.
The O-Ring is potentially suspect........it will hold when the coolant is warm and drain when cold.
Charlie
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2005 X5 4.4i______
Jet Black/Beige Leather
Sport Package Premium Package Rear Climate Package 19" Alloy Wheels (132) Ipod Connex. (In Glove) 1 Owner...Odom=29.5k miles
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