1993 Honda Civic Owner's Manual - Page 165

If Your Engine Overheats 4. If the temperature gauge stays at the red mark, turn off the engine. 5. Wait until you see no more signs of steam or spray, then open the hood. 6. Look for any obvious coolant leaks, such as a split radiator hose. Everything is still extremely hot, so use caution. If you find a leak, it must be repaired before you continue driving (see Towing on page 174). 7. If you don't find an obvious leak, check the coolant level in the radiator reserve tank (see page 115). If the level is below the MIN mark, add coolant to halfway between the MIN and MAX marks. 8. If there was no coolant in the reserve tank, you may also have to add coolant to the radiator. Let the engine cool down until the pointer reaches the middle of the temperature gauge, or lower, before checking the radiator 10. Start the engine and set the heater control lever to maximum. Add coolant to the radiator up to the base of the fill neck. If you do not have the proper coolant mixture available, you can add plain water. Remember to have the cooling system drained and refilled with the proper mixture as soon as you can. 11. Put the radiator cap back on tightly. Run the engine and watch the temperature gauge. If it goes back to the red mark, the engine needs repair. (See Towing on page 174.) 12. If the temperature stays normal, check the coolant level in the radiator reserve tank. If it has gone down, add coolant to the MAX mark. Put the cap back on tightly. Removing the radiator cap while the engine is hot can cause the coolant to spray out, seriously scalding you. Always let the engine and radiator cool down before removing the radiator cap. 9. Using gloves or a large heavy cloth, turn the radiator cap counterclockwise, without pushing down, to the first stop. This releases any remaining pressure in the cooling system. After the pressure releases, push down on the cap and turn it until it comes off. Taking Care of the Unexpected