Check for a vacuum leak.
'Well I have a 95 Buick LeSabre, and the check engine light keeps coming on. So I asked a guy at car-x, and he said that usually occurs when you go really slow on the interstate.'
Most likely a cracked intake manifold.
The fan should keep running for a few minutes even though the car is off because the engine still is registering hot and needs to be cooled down but, if it continues you to run then you have an electrical problem that needs to be attended to immediately.
You have a blown head gasket. Antifreeze that should be going through a hole in your gasket and then cooling the engine head is going into a cylinder. From there it is going out an exhaust pipe as steam. It is also getting into an oil drain hole and getting into the oil pan. It is inexpensive to get a head gasket fixed compared to the cost of having a blown engine replaced.
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If you meant harmonic balancer keeps going bad you probably have a bent pulley.
It keeps the camshaft in time with the valves
Another commone sence answer. it keeps clicking because it is telling you that your gas tank is full and if you don't stop trying to add more gas then it will overflow on the ground. I am sure you don't want to pay for gas on the ground but then again you probably want to know why you have to pay for the gas you just wasted since you didn't know why the pump clicks.
Oil is not a coolant, it is a lubricant, but it keeps the engine lubricated to prevent friction, which reduces heat and makes is run cooler. Water in the radiator, and the radiator fan, is what keeps the engine cool.
Governor
fuel, fire, and compression
It prevents the liquid within the engine from freezing or boiling. Coolant does just what the name implies. It keeps the engine cool, meaning it keeps the engine at the correct operating temperature. It also prevents corrosion within the engine and cooling system.