If you did not winterize the head properly, that is to say by pouring Auntie Freeze not only in the bowl and pumped through the
line to the
holding tank but as well by pouring Auntie Freeze on the intake side of the
pump, you could have damaged the
pump assembly. Do not fear your MSD my son, you can rebuild it with a simple kit. It may save your butt some day. Pun intended!