hi fellos, i wonder if anyone can look at their truck and tell me the heater hose routing on an 89 with a 5.7. mine has no hoses . the nipples are plugged off. i want to put on new hoses and see what happens as its getting cold now. i guess what i really need to know is which hose nipple on the firewall does the hose coming from the motor go to , the upper or lower. thanks