can a failing water pump sound like rattling or popcorn until the motor begins to over heat? the sound is nearthe waterpump. it goes away once the temp starts to overheat.the temp will get near redline then go down to normal and then start creeping up again. thanks for any replies.
I wouldn't do that one very often. It could be the impellers on your water pump (broken or seized)..in which case it will need replacing
Yes it can! I am curious though if what you are hearing is a really bad water pump or spark knock due to excessive heat or possibly a blown head gasket. Remove the belt and shake the pulley on the water pump. If it moves or rattles at all, then it is probably bad. Seems strange that it hasn't tossed the belt off though if it were that bad. Worth looking though, testing is free, parts are not....
