The plastic impeller is inside the water pump...it's what moves (impells) the water through the cooling system...If your car is over heating it's likely to be a water pump, and if it was replaced by a Ford dealer the updated pumps still have plastic impellers. If you're car is functioning fine I wouldn't waste the energy, but if you insist...it's not worth cracking the seal on your current pump to check...if you check it - replace it- this will save you a headache later on.


1995 Mystique
2.5L V.6 DOHC MTX
Magnaflow Exhaust, KKM, Ford Motorsport 9mm Wires
135,000mi on car/ 40,000 on engine
I'm a tech in a Ford garage and I hate working on these things, but I love my car.