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Across 3. Circulates the coolant through the engine and radiator. 4. A radiator cap that contains a spring that will not allow pressure to escape from the system until a certain level is reached. 6. A switch used to turn on the fan independent of the on-board computer. 8. Disconnect the upper radiator hose from the radiator and add coolant to the engine to minimize the amount of air being trapped. 10. Forces water through the radiator in a direction opposite of normal flow. 11. A sealed drive clutch assembly filled with silicone. 14. A chemical used to flush the cooling system. 16. Helps remove air from the cooling system. 17. Used to prevent coolant circulation when the engine is cold. 18. A cooling fan driven by an electric motor. 19. The amount the belt is tightened.

Down 1. A tool used to check antifreeze. 2. Hoses can become weakened by the reaction between the chemicals in the coolant and the metals in the engine and radiator. 5. A nontoxic antifreeze and is considered to be environmentally safe. 7. A pump attached to radiator to check for possible leak. 9. Uses fins to remove heat from the engine. 11. To close holes left in the engine block and head after casting. 12. A poisonous antifreeze. 13. A liquid used in the cooling system to prevent it from freezing. 15. When an engine has steam spurting from the overflow.