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TSB Main Page
TSB
99-20-7
  • COOLING SYSTEM - 3.8L - UNDETERMINED LOSS OF COOLANT
  • COOLING SYSTEM - 4.2L - UNDETERMINED LOSS OF COOLANT
  • ENGINE - 3.8L - ENGINE OIL CONTAMINATED WITH COOLANT
  • ENGINE - 4.2L - ENGINE OIL CONTAMINATED WITH COOLANT
Publication Date: SEPTEMBER 23, 1999

FORD:
1996-1997 THUNDERBIRD
1996-1998 MUSTANG, WINDSTAR
1997-1998 E-150, E-250, F-150
MERCURY:
1996-1997 COUGAR

This TSB article is being republished in its entirety to correct the front cover/water pump bolt torque values and the Front Cover Gasket Part Number.

ISSUE:

Engine coolant may be leaking into the engine oil on some vehicles. The internal coolant leak may be difficult to identify. This may be caused by the lower intake manifold side gaskets and/or front cover gaskets allowing coolant to pass into the cylinders and/or the crankcase.

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