Typically not. A leak-down test will though. Another method is to head
to your local smog station and have them put their emission analyzer
probe near the removed radiator cap.  It will detect the presence of
exhaust in the cooling system.

Jim

Dave Vieira wrote:
> Wouldnt a compression test show if there is a leak
> like that or not . ? .
>
>
> --- Jim Arnott <jrasite@eoni.com> wrote:
>
>>Classic symptoms of an engine that needs a reseal.