The cooling system of your Volkswagen Jetta plays a very important role in order to make your car operate properly. The cooling system keeps the right temperature of your car’s engine through the circulation of coolant through the engine which then gathers up heat and passing it through the radiator where it is cooled with air. It is through a thermostat valve where the coolant passes to be able to control flow and then via a temperature sensor controlling external air cooling fans. The cooling system is comprised of three major components: the water pump, radiator and sensors, thermostat and hoses. The water pump has an important role to play and without it how will the cooling system actually work? It is in charge to handle the pumping function of the system keeping the coolant mixture moving. It is found in front of the vehicle’s engine while being driven by a belt. Here, the coolant is being moved from the outlet of the lower radiator section through the engine using a centrifugal action of an impeller along the pump shaft. The water pump impeller provides a passage of the coolant through the engine block. In early engine designs, the use of plastic impellers was practiced. But some say that the use of plastic impeller is not an advantage. This is because plastics are common to get brittle, flakes, and cracking. Damaged water pumps will no longer function which could greatly contribute to overheating of the engine system. So to prevent this condition, plastic impellers were replaced with metal impellers. And because we know you would want to have a durable water pump impeller to be installed in your 2002 Volkswagen Jetta, we offer you the G3000-67342 Laso water pump metal impeller.