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I have a 1998 c 3500 6.5. It has 259,000 miles. Engine had never ran hot. Blew out a freeze plug. Replaced freeze plug. Blew it again but a different hole. I flushed my cooling system with blue devil. Drove it 16 miles and it blew out another one. I’ve used brass, steel, and rubber freeze plugs. I have no water in the oil but was told it could be a d head gasket. Can anybody help?
 

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Signs of a headgasket issue:
Hard upper coolant hose with the engine running at idle
Bubbles in coolant recovery tank with engine running at idle
White smoke from exhaust that smells sweet
 
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None of those issues. So why do you think I would keep blowing freeze plugs? Any suggestions? Could the holes be egged? I’ve replaced every freeze plug in the block.
 

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None of those issues. So why do you think I would keep blowing freeze plugs? Any suggestions? Could the holes be egged? I’ve replaced every freeze plug in the block.
Remove the coolant recovery tank cap and place a latex glove over the hole. If it blows up the glove you got pressure building up..
Are you using quality plugs or aftermarket specials from eBay?
 

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