Engine Oil. The engine oil helps keep the engine cool, as well as lubricating it. Make sure there is enough engine oil. If you have an oil temperature gauge, make sure the temperature is within the proper range while you are driving. Engine Coolant. Before starting out, make sure the engine cooling system has enough water and antifreeze according to the engine manufacturer's directions. (Antifreeze helps the engine under hot conditions as well as cold conditions) When driving, check the water temperature or coolant temperature gauge from time to time. Make sure that it remains in the normal range. If the gauge goes above the highest safe temperature, there maybe something wrong that could lead to engine failure and possibly fire. Stop driving as soon as safely possible and try to find out what is wrong. Some vehicles have sight glasses, see-through coolant overflow containers, or coolant recovery containers. These permit you to check the coolant level while the engine is hot. If the container is not part of the pressurized system, the cap can be safely removed and coolant added even when the engine is at operating temperature. Never remove the radiator cap or any part of the pressurized system until the system has cooled. Steam and boiling water can spray under pressure and cause severe burns. If you can touch the radiator cap with your bare hand, it is probably cool enough to open. If coolant has to be added to a system without a recovery tank or overflow tank, follow these steps Shut engine off. Wait until engine has cooled. Protect hands (use gloves or a thick cloth. Turn radiator cap slowly to the first stop, which releases the pressure seal. Step back while pressure is released from cooling system. When all pressure has been released, press down on the cap and turn it further to remove it. Visually check level of coolant and add more coolant if necessary. Replace cap and turn all the way to the closed position.