first let me say im no mechanic. 454mpi 1999 few weeks ago water impeller went out, which was 2yrs old and i was about to replace. So i put new one in, put on hose ,work perfect! went to lake ran 20 miles no problem, next day no problem. Bring home ,put on hose, no water. So i change again, took oil cooler hose off thermostat housing and back flushed. put a new one in and ran on hose twice and all looked good. Ran yesterday about 30 miles, temp was the usuall 180 and ran great. Well just put on hose to flush and no water again! Any thoughts? the oilcooler strainer clogged is one friends guess? thanks!