timing retarded not correct electric fans--they BLOCk air and are not needed no fan shroud--fan at wrong depth in shroud-- no wire in bottom hose causing it to close up crusty radiator--one fresh back from the shop may be new paint and "rodded out" but in no way has the capacity it once did
I never see bad gauge, pumps ( as long as they don't leak) , or jetting off enough to cause issues