Can you destroy the water pump buy running the engine without muffs? I had a power steering fluid leak so I took the water hoses off the cooler and ran the engine for a minute to see if power steering fluid was leaking into the cooler. I did start to get some white smoke from the hose that came from the out drive so I shut the engine off. After I hooked the hoses back up put the muffs on the engine it would start to over heat after about five minutes of idling. Went to take the termostate state out but it was already gone. I pulled the hose that feeds the engine from the out drive and water was coming out. May be just not enough? Before all this happened the temp gauge would stay at 160. And that was with a missing freeze plug. Now it pegs the gauge at 240. If I did kill the water pump wouldnt the water pressure from the garden hose push the water through the engine?