Quote Originally Posted by wrenchinrick
have you checked to make sure the bottom radiator hose can not collapse at higher rpm the water pump can create enough suction to collapse a hose.many bottom rad hoses have a spring in them to prevent this.you may be able to see this if you rev up the engine and watch the bottom hose for any sign of collapsing.good luck and keep us posted
you were on the money, had someone rev the engine & hold it a 3,500 rpm , & bottom hose collapses nhalf way, going to swap it out this weekend