Silly question, but did you pull out the poppit valve too? If you didn't, and it's stuck open, the water from impeller will go straight into the exhaust and not thru to the thermostat.Thanks for all the input. I have a new oem impeller on the way. The pee hole is molded into the bottom of the engine cowling and I can see no hose anywhere. I have been able to get a trimmer line in about 2 inches. There was no water being pumped up to the thermostat. I dropped the lower unit and submerged it into a barrel of water and spun the drive shaft with a drill and very little water was being pumped. I'll let you know after the new impellaer arrives.