1945428 | Genuine Paccar® Water Pump For MX13

A water pump 1945428 in a vehicle is a key part of the engine’s cooling system. Its main job is to circulate coolant (a mixture of water and antifreeze) through the engine and the radiator to prevent the engine from overheating. Engine Water Pump For PACCAR MX-13, 12.9L diesel

General Specifications

Fitment

Fitment can vary by engine build and options. Match the part number on the part you are replacing, or contact us with your vehicle details before ordering.

Purpose & Function

The purpose of using a water pump in a vehicle is to keep the engine at a safe operating temperature by circulating coolant through the engine and radiator. Without it, the engine would overheat very quickly, which can cause serious damage like warping the cylinder head, blowing the head gasket, or even seizing the engine.

In short, the water pump:

1. Moves coolant through the engine to absorb heat.

2. Pushes hot coolant to the radiator to release heat into the air.

3. Maintains consistent engine temperature, improving efficiency and preventing damage.

Signs of Bad Water Pump

• Engine Overheating – The most obvious sign. If the water pump isn’t circulating coolant properly, the engine temperature rises quickly.

• Coolant Leaks – Look for puddles or drips of coolant (usually green, orange, or pink) under the car, often near the front of the engine where the pump is located.

• Whining or Grinding Noise – A worn-out water pump bearing can make a high-pitched whining or grinding sound, especially when the engine is running.

• Steam from the Radiator – Steam coming from the hood indicates the engine is overheating due to poor coolant circulation.

• Corroded or Rusty Pump – Visible corrosion, rust, or buildup on the water pump itself can indicate slow leakage or impending failure.

• Coolant Temperature Warning Light – The dashboard warning may come on if the engine is getting too hot.

• Loose or Wobbly Water Pump Pulley – If you can move the pulley by hand or it has play, the pump is failing.

About Paccar

PACCAR Inc is a global technology leader in the design, manufacture, and customer support of premium light-, medium-, and heavy-duty trucks. Founded in 1905 and headquartered in Bellevue, Washington, PACCAR is best known for its world-class truck brands: Kenworth, Peterbilt, and DAF.
PACCAR’s trucks are recognized for their durability, fuel efficiency, advanced engineering, and driver-focused technology. In addition to truck manufacturing, PACCAR also designs and builds diesel engines, and provides financial services, information technology, and aftermarket support to its global customer base.