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Why wont the radiator petcock in a 1999 Yukon go back in?

Updated: 8/16/2019
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13y ago

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I just ran into this problem. The petcock is plastic and has a metal pin protruding thru the side. This pin rides in a "track" and locks the petcock into place when you put it back in. I broke the pin removing the petcock and had to remove the radiator to repair it. You may be able to do this with the radiator in place. See if you can feel the track and if you replace the pin, you will feel it lock into place when you reinstall the petcock. The pin can only protrude on one side of the petcock so that the petcock will seat correctly. Good luck.

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Q: Why wont the radiator petcock in a 1999 Yukon go back in?
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