I studied "fan behavior" because of a failed waterpump and later the a/c in my Mystique. M on normal is where both of our Mystiques turn on the cooling fans (when the a/c is not in use), then the temp should drop. Fans run on low speed at that time. Fans go to High speed when the a/c is on, sometimes for a minute or so, drop back to low. Fans always run with a/c on. Do you remember if the new waterpump had (black or white)plastic or metal impeller wheel? Seems a recent waterpump should not have failed yet regardless, unless many miles have gone by, but check it first, along with coolant level.
