Suspect water pump

Z_ealot

Radiator pressure test passes, block test passes and no pressure left in system when car is run hard and left to cool down overnight, all of which would have indicated a blown head gasket. Only thing left to provide a definitive answer on that would be a compression test which i will most likely do after swapping out the water pump, but i have my doubts that the head gasket has anything to do with it as i have been talking to several other mechanics including those at corner 3 garage and with all the information I've given them they doubt it's the head gasket as well and have come to one of two conclusions....either the water jackets around the cylinders are clogged or the water pump impellers have corroded away. Being that their is no record of the coolant system ever being flushed or serviced and with all the troubleshooting that I've done along with the mechanics it leaves me with the only component i havent addressed in the system, which is the water pump. I know it's hard for some to believe that our water pumps could fail due to how they are constructed, but with how acidic coolant can become after so many years of not being changed you kinda have to entertain the possibility of that acidity eating away at the impeller on the pump. I will update this thread when i get the time to change out the pump and will let everyone know the results along with pics if i can get them.