I have an oil leak on the right front side of my 2004.5 gmc diesel. It appears to be leaking from the intercooler lower hose connection. I could tighten the connection, but fear this is not the real concern.


Should there be oil in this line?

I have an oil leak on the right front side of my 2004.5 gmc diesel. It appears to be leaking from the intercooler lower hose connection. I could tighten the connection, but fear this is not the real concern.


Should there be oil in this line? I wouldnt be very concerned with oil in the intercooler, Some oil is normal, however, it its enough to leak, that seems odd

I just found this info...
<H1>Turbo Air Charge Cooler Hoses Oil Seepage or Blows Off on Acceleration - kw black smoke boost noise turbo clamp leak oil LLY 6.6 whistle DTC P0299 low intake hose surge no power #PIP3068A - (Aug 4, 2004)</H1>


Turbo Air Charge Cooler Hoses Oil Seepage, or Blows Off On Acceleration


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The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.<A name=ss1-1542155><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1542155#ss1-1542155" target="_blank">
<H5>Condition/Concern:</A></H5>


Oil seepage from turbo air charge cooler hoses or hose blowing off during acceleration. Possible DTC P0299.

<LI =1>Due to the closed PCV system on the 6.6 LLY engine it is normal to have oil residue in the air charge cooler hoses and pipes.
<LI =1>The oil will migrate to the lower areas of the air charge cooler system and may cause customer concerns of oil seepage.
<LI =1>This may also cause the Air Charge Cooler hoses to blow off when turbo boost is high. </LI><A name=ss2-1542155><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1542155#ss2-1542155" target="_blank">
<H5>Recommendation/Instructions:</A></H5>

<LI =1>Do a visual inspection of air charge cooler connections and hoses.
<LI =1>Replace air charge cooler hoses, pipes, or clamps if damaged.
<LI =1>Properly clean all oil from air charge cooler pipes and hoses.
<LI =1>Air charge cooler hoses and pipes are marked for proper installation. The hoses are marked with ENG, DUCT, or CAC (charge air cooler) the hoses and pipes must installed correctly. The engine side is marked ENG, the duct side (the aluminum pipe) is marked DUCT, and the charge air cooler side is marked CAC.
<LI =1>Apply a very thin coat of sealer part number 97720043 to the air charge cooler hose connections.
<LI =1>Install hose and properly torque air charge cooler hose clamps to 53 lb in/6 Nm. </LI>


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Thanks for the quick reply-- I really appreciate it. http://www.dieselplace.com/forum/smileys/smiley1.gif

had on with a bad turbo. all the oil went to the intercooler.

Thanks DMT





I also have the same concern with the oil coming from the lower cooler hose. I was going to post myself before I finally found this post after searching several different ways. I am having a little oil consumption and was concerned. Other than that the engine seems to be performing well.

Local Dealer cleaned the hose connection, applied the sealer, and tightened the clamp. It all seems OK for now. They also reflashed the computer, but can't feel much difference. Does seem like less noise at idle.


11,000 miles all stockEdited by: haubstadt