Chevy/GMC Duramax 01-04 LB7 Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines

Coolant leak????

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  #1  
Old 01-06-2011, 07:11 PM
Back-in-Black's Avatar
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Default Coolant leak????

2002, LB7.

Very slight coolant leak. When pressurized, you can see a small amount of coolant drip off the oil filter.

Anyone got a clue where this is coming from??
 
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Old 01-06-2011, 07:24 PM
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I have an 02 and my coolant leaks at the reservoir.
 
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Old 01-07-2011, 11:45 PM
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could be from a hose with a wear spot or the water pump possibly...
 
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Old 01-12-2011, 01:38 PM
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heads maybe
 
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Old 01-19-2011, 08:26 PM
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Or it could be from the cross over built into the bellhousing. There are 2 plates bolted back there on the top slants, one goes to the oil filter housing and the other is blocked off. Had a coolant leak on mine and it ended up being a broken bell housing
 
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Old 01-22-2011, 06:19 PM
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Some good places to look. Thanks for the replies. I know it's not the water pump because that's what I thought it was and why I pressurized it. It's coming from somewhere in the rear of the motor and it's just barely dripping when under pressure.
 
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