An engine may overheat when the following conditions exist:

1. The radiator core is dirty.
2. The radiator core is obstructed.
3. The radiator leaks.
4. Use any of the following materials in order to clean the outside of the radiator:

•	A soft bristle brush and clean hot water (or a mild detergent such as car wash or dishwashing liquid)

•	A common city water hose without the nozzle (in order to avoid damage to the fins)

5. Pressure flush the core tubes with clean hot water or a mild detergent in order to clean the inside of the tubes.



6. Use the following procedure in order to test for restrictions in the radiator:

6.1.	Turn on the engine in order to warm the engine.

6.2.	Turn off the engine.

6.3.	Feel the radiator.

Verify that the following conditions exist:

•	The radiator is hot on the top.

•	The radiator is warm on the bottom.

•	The temperature rises evenly from the top to the bottom of the radiator.

•	Cold spots in the radiator indicate clogged sections.