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Q: My Chevy 2001 2500 HD is leaking coolant. on 2001 Chevrolet Silverado 2500 HD

The top right corner of the radiator (driver side)looked like where it was leaking from. A small leak mark ground indicated this. I replaced the threaded connector where o rings are located. Now it's leaking from the passenger side and the water mark is much bigger. What can it be?
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What you describe as leaking sound like the cooler lines but it sounds like the radiator itself may have a problem, it's hard to say what to do to fix t without being able to see the problem first hand. The way an automotive shop would locate the leak is by removing the radiator cap and attaching an adapter that screws on in place of the radiator cap. Something that looks like a bicycle pump with a pressure gauge attached to it is used to "pump up" pressure to simulate pressure generated when the cooling system is at operating temperature, the leak is then found sometimes it is obviously leaking from a coolant hose or cracked housing or radiator.
Thanks, I'm going to try to locate the leak this weekend. The temp is not changing but there is a small water mark under the truck. I'm curious to see what happens today and how big the water mark is. Thanks again for you help.
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