One problem related to water pump has been reported for the 2004 Ford Explorer. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Ford Explorer based on all problems reported for the 2004 Explorer.
The original equipment harmonic balancer came apart. The inner portion separated from the rest. This allows. It would have caused the destruction of the serpentine belt, and crankshaft position sensor if I had not caught it in time. This would have resulted in loss of engine power, loss of power steering, and loss of power brakes! this seems to be a common problem with the 2004 Ford 4. 0 liter v6. This could result in somebody losing control of the vehicle with little or no warning. I was replacing the water pump on my vehicle when I saw this defect.