Check 4 - Coolant level. Check your coolant level and make sure it is just above the cooling fins in your radiator. Even the smallest amount of coolant loss can be a good indicator that your engine has a problem. If you are consistently losing coolant your engine is running too hot, you have a leak, or your radiator cap is bad. Engines that are consistently hot can mean a worn top end, bottom end, clutch, low or contaminated oil. Check for coolant leaks in the radiator, head gasket, hoses and water pump seals.