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Close to the glow plug is a freeze plug. Go to a auto part store and get radiator dye. Run about a week then with a light look for the color you put in around the plug. This will tell where the water is coming from. If water is coming from the glow plug this may mean a cracked block. Most likely it's a water plug. Some farm tractor part outlets have a tester for glow plugs.

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Q: 1988 Chevy 2500 6.2 diesel leaks coolant from rear of block not from any hoses your radiatorIf been told it be coming from where glow plug is also how can you tell if glow plug is working well?
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