thanks 4 that advice, its a sapph 4x4 if that maks a diference. blowing hg? wont the car use water if this was the problem? do the pipes top and bottom make a difference? as the top one conects 2 the return side of the stat and as a plumber i was allways told the return should never be at the top. gona flush it out on weekend but want 2 put pipes in the corect place. thanks again 4 the advice