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How Do I Drain, Flush and Refill My Yanmar Tractor Cooling System?

We want to help you drain, flush, and refill your Yanmar tractor cooling system.

If you do not feel that you understand these steps, or can perform them safely, consult your tractor dealer, owner’s manual, or local mechanic.

Time to get started.


  • Never remove the radiator cap if the engine is hot. Steam and hot engine coolant will spurt out and seriously burn you. Allow the engine to cool down before you attempt to remove the radiator cap.

  • Tighten the radiator cap securely after you check the radiator. Steam can spurt out during engine operation if the cap is loose.

  • Always check the level of the engine coolant by observing the reserve tank.

  • Failure to comply will result in death or serious injury.


  • Wait until the engine cools before you drain the engine coolant. Hot engine coolant may splash and burn you.

  • Failure to comply could result in death or serious injury.


Wear eye protection and rubber gloves when you handle a long life or extended life engine coolant. If contact with the eyes or skin should occur, flush the eyes and wash immediately with clean water.

Failure to comply may result in minor or moderate injury.


  • Follow the guidelines of the EPA or other governmental agencies for the proper disposal of hazardous materials such as engine oil, diesel fuel, and engine coolant.

  • Consult the local authorities or reclamation facility.

  • Never dispose of hazardous materials irresponsibly by dumping them into a sewer, on the ground, or into groundwater or waterways.

  • Failure to follow these procedures may seriously harm the environment.

Engine coolant contaminated with rust or scale reduces the cooling effect. Even when the extended life engine coolant is properly mixed, the engine coolant gets contaminated as its ingredients deteriorate. Drain, flush and refill the cooling system with new coolant every 1,000 hours or once a year, whichever comes first.

1. Allow the engine and coolant to cool.

2. Remove the radiator cap (Figure 5-15, (1)).

3. Remove the drain plug or open the drain cock (Figure 5-15, (2)) at the lower position of the radiator and drain the engine coolant.

4. Drain the coolant from the engine block. Remove the coolant drain plug (Figure 5-16, (1)) from the engine block.

5. After draining the engine coolant, flush the radiator and engine block to remove any rust, scale, and contaminants.

6. Reinstall and tighten the drain plug or close the drain cock at the radiator. Reinstall and tighten the engine block drain plug.

7. Fill the radiator and engine with engine coolant.

If you need any further help or have any questions about cooling systems, tractors, or anything else, please contact your dealer, local mechanic, or call us at 602-734-9944. Please ask about our current new and used tractor supply.

Team Tractor and Equipment - #1 Tractor Dealer in Arizona. We sell and service most major brands of tractors including Yanmar, Kubota, John Deere, TYM, Mahindra, Kioti, Case, New Holland, Massey Ferguson, Ford, Deutz, Case IH, Farmall, International Harvester, Branson Tractors, LS, Shibura, Claas Tractor, McCormick Tractors, Valtra, Solis, YTO, Montana, and Nortrac.

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