Farming machinery typically fueled by diesel or gasoline, these power plants use an engine-driven pump to circulate coolant through passages in the engine block and cylinder heads. Engine cooling tubes and engine cooling hoses are important parts of this system, and are made of rubber and plastic materials that resist water, antifreeze, and corrosion inhibitors. These coolant tubes and hoses must also resist extreme service temperatures.

Coolant hoses for tractor engines are often made of elastomers such as silicone, EPDM, or neoprene. Runs of hose are either straight or branched, and may be reinforced with wire or fabric. For radiator hose, the SAE 20R4 D1 standard describes construction characteristics. Rubber and plastic parts for engine cooling systems may also include auxiliary cooling assemblies for tractor transmissions. High temperatures can cause transmission fluid to break down and increased component wear to occur.