Calling all Merc Mechanics

[76GMC1500]

The water coming out of the pissers should be warm, this means it has picked up heat within the engine and carried it out. *If it's hot, that means the water is spending too much time in the engine/there isn't enough flow. *This is a sign of a bad water pump. *If the water is cool, but the engine is hot, this means the water is bypassing the engine and just going through the manifolds. *This indicates a stuck thermostat. *If the pee stream is cold and the engine is cold, this indicates a thermostat that has failed open. The fact that you said the engine is loder than normal also indicates a lack of water flow and now I can say with some confidence that your pump is bad.