1991 Chevy S10 Blazer 4dr 4.3l TBI “5LM60”
I replaced my water pump due to a bad bearing and followed all specifications according to the haynes manual. Every once in a while there is a strange whining/grinding noise almost like a blender. My coolant is at the correct level in the radiator, but it almost sounds like an air bubble is trapped and keeps getting circulated through the system. I had this issue ever since replacing it, as well as first startup.