A lesson this cranky old bloke should take on board at times too, be polite and mindful of others. Back to the subject on hand, you mentioned checking the bottom radiator hose and decided it appeared soft, I would recommend you replace it and make sure it has the coiled spring inside. When I read your original post I thought of the hose sucking in itself straight away but the other guys have all feed you good information to try. Your Camaro is my all time favourite model above the sixties models even but then, some people say I'm sick in the head.....