The truck started emitting a very strong odor of coolant and had coolant present under the vehicle. This is the second time the truck has had the heater core replaced @ a $1000 a time.
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Newest reported 1998 Ford F-150 problems
There is a technical service bulletin for the V8 engines regarding a possible problem with the spark plug being ejected from the cylinder head, damaging the threads in the spark plug hole. If the vehicle is under warranty, cylinder head replacement is recommended. If the vehicle is out of warranty, Ford authorized the use of a specific thread insert to repair the head.