Has anyone ever had to replace an upper or lower water bypass tube on a V6 3.8 Firebird? I was able to get the parts (upper and lower tubes with O'rings) at a local GM dealer but I really don't know what has to be removed to replace these plastic tubes? It looks like 1 end goes to the heater hose and the other towards the block but I canot see far enough back. I am really wondering if it requires alot and I should get the car towed to a shop and have them do the repairs.