I had this one come in for no heat in the winter,the water pump impeller had broken off,so I replaced it and all was good,comes back 2 weeks later same problem,replaced the water pump and off it went, a week later same thing,so I called the hotline and told me that it was do to bad water pumps and how they are shipped,so they told me to keep replacing water pumps till I find I good one or replaced the front cover to the new style so you can put the bigger water pump in,has anyone heard of this or I am missing something that be causing the impeller to bust off? one other note is that this is a reman engine that no longer has warranty