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Message: [QUOTE="76GMC1500, post: 1195584, member: 73139"] First, start it and run it with the radiator cap off. Make sure the water pump is circulating water. If you give it a rev, you should see a lot of water moving through the radiator. If the water pump is working, your system isn't holding pressure. Pull the water pump cover and check for pinholes in the right side cover. Pull the head and check for head gasket leaks. Replace the radiator cap. [/QUOTE]