Report: Overheating Due to a Damaged Impeller
Lincoln Navigator Problem
Engine Affected: 5.4L V8
Average Mileage: 112,500 mi (111,000 mi - 114,000 mi)
Erratic engine coolant temperature or intermittent overheating can be caused by corrosion inside the water pump. The impeller may spin on the water pump shaft or the impeller may corrode. Either condition reduces coolant circulation resulting in engine overheating.
The vehicle overheated when going up a mountain pass. We had several opinions from a couple of dealers none of which were valid but would have cost $800 plus on a maybe. When we got home our regular mechanic figured out the problem was the disinigrated water pump and replaced it for less than $200.
Visitor, 1999 Lincoln Navigator, 5.4L V8, 111,000 mi
I had a problem with overheating when going over passes to Montana. It was fine on level land where I live so let it go until I had no heat in the winter. Our mechanic found the propellers on the water pump were totally gone. He said Lincoln or Ford makes the water pump with disinigrating materials. We had to get our system including the radiator flushed before we figured out the problem and now we still have debris in the water. I see the problem has continued through 2010. You would thing they would have fixed it by now. Seems as if this should be a class action lawsuit.