Thumping sound from cooling system
1991 Ranger 4.0 V6: "Thumper" has lived in my glovebox for many years. The sound is intermittant. When it is present, if I grab onto the top radiator hose, I can feel it pulsating. Doesn't happen all the time; when it does, the engine is at idle speed and fully warmed-up. No visible coolant leaks. I did read a couple of posts regarding the problem. If anyone solved the problem, can you provide me with the specific fix? Thanks!