A liquid cooling system includes at least one fluid line in fluid communication with an intercooler for circulating a coolant through the intercooler. An inlet port assembly interconnects the intercooler and the at least one fluid line. The inlet port assembly defines an opening for introducing the coolant into the liquid cooling system. The inlet port assembly is rotatable relative to the intercooler and the at least one fluid line between a fill position, in which the opening is disposed in a vertically upright orientation, and at least one operating position, in which the opening is disposed in a non-upright orientation. A shield is moveably positioned relative to the intercooler to define an attached position preventing rotation of the inlet port assembly into the fill position, and a detached position, allowing rotation of the inlet port assembly into the fill position.