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Discussion Starter #1
I have a coolant leak from the back of the engine it's not the adapter plate or anything from the egr or the heater hoses I can see it dripping onto the down pipe I'm new to this site any ideas would be appreciated.
 

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Welcome to DieselPlace
Please tell us a little more about your truck ( Year, Make, and Model) and list any mods
(y)
 

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Discussion Starter #3
Hello and thank you for the quick response my truck is a 2005 gmc 2500hd 4x4 engine is completely stock other than doing the pcv reroute and resonator delete it's got 220k miles
 

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Hello and thank you for the quick response my truck is a 2005 gmc 2500hd 4x4 engine is completely stock other than doing the pcv reroute and resonator delete it's got 220k miles
My guess is the rear coolant block off plate
 

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Discussion Starter #5
I checked out the video it's not that plate it's leaking from above because it running off of the down pipe.
 

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If it's not the blockoff plate, heater hose then try looking in the valley of the motor around the Turbo and see if you have coolant laying in the valley
 

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I apologize for the delay. I looked in the valley it does look really brown/rust color but not wet and might be from the 1 owner on this truck had the manifold pulled at the dealership to check for possible head gasket but it turned out to be a hose if I remember correctly. It will start to smoke or steam about 3min after I start it ill leave the block plugged in over night to get a pic in the morning.
 

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I apologize for the delay. I looked in the valley it does look really brown/rust color but not wet and might be from the 1 owner on this truck had the manifold pulled at the dealership to check for possible head gasket but it turned out to be a hose if I remember correctly. It will start to smoke or steam about 3min after I start it ill leave the block plugged in over night to get a pic in the morning.
The next thing you'll need to do is to pressurize the coolant system to help chase the leak down and locate it
 

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Discussion Starter #10
Hello again I have a few pics of the leak it foams up when the motor is running then burns away when it's turned off.
638833
 

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Discussion Starter #12
The foam is visible in the 2nd pic kinda looks like cotton pulled apart that's in between the thin gasket and the exhaust manifold.
 

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Check for coolant in the valley of manifold. could be small hose under thermostat leaking into valley and coming out on back of manifold.
 
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Could it be a head gasket ?
Possible, but I'm not seeing any soot around the gasket, only the coolant foam.
Check that area member Captain-A mentions and see what you find
(y)
 
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