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usually is located under the goose neck that the upper radiator hose is attached on the engine. but different engines have aother locations, like at the lower radiator hose where it connects to water pump. try the upper hose first.
If the radiator is leaking, put a bottle of radiator stop leak in it,fill it up the rest of the way with water, tighten cap, and run in idle for 15 to 30 minutes. If the leak is severe or one bottle doesn't work, use two bottles of stop leak and run for 35 minutes.
If it's the radiator cap that's leaking, replace the cap with a new one. Also check to make sure there are no loose cooling hoses.
Safety first: Use extreme caution to never remove the radiator cap when the engine is hot, severe burns from escaping hot water could result.
No reason to. It is normally flushed out all the time by normal use. Sediment builds up in the engine and radiator, not heater. If the heater not getting hot enough, it is most likely the engine thermostat or the heater control valve. When you start a cold engine, the main radiator hose to the thermostat should stay cold for about 5 minutes, until the engine is totally up to temperature. Only then should the thermostat open and allow that hose to instantly get hot. If it slowly gets warm, then it is stuck open and needs replacement.
Was the water pump brand new or rebuilt? I have seen rebuilts fail on the first test drive. Before pulling the head, I would take it to a shop and request a CO2 test to check for combustion gasses in the cooling system. Shouldn't cost more than $30 and is a pretty definative test.
check to see if you can spin the fanwhile the engine is cool it should spin freely,if it doesnt fan clutch,also I would switch the fan back to oringinal just to test if this is the problem,if it is youll have to design a different fan shroud if you want to use you new fan,if everything done above is ok with the engine cool take off the radiator cap and squeeze the bottom hose 4-5 times in burst this will make sure you dont have air in the system,if this is helpfull please vote me a fix ya