Originally Posted by
giantslayer
Also I replaced the lower radiator hose and when the truck has run for a while I've noticed the upper radiator hose will be hot but the lower radiator hose will be cool.Is that normal? I don't belive it is.
im going to leave most of your questions for others (search too would have helped you before flush/replacing t-stat though fyi.)
hot coolant in (upper hose) - radiator does its job (radiates the heat away from the coolant) - cool coolant out/back into block (lower hose.)
so having a much cooler lower hose than the top hose is normal.