Loosing coolant at idle

[wdino73]

I'm confused so what is new...LOL My ??? is when my truck set and idle for 15mins or longer coolant comes out the overflow, but I just drove 800 miles towing 15000 lbs. and I never lost a drop.. Which leads me to believe it's not a Headgasket. Heads are studed and cometic gaskets. any thoughts???

 

[jlawles2]

Waterpump? Might have spun the impeller.

 

[TeaBagger2006]

X2

 

[RPM Motorsports]

Change the cap.

 

[jmaz268]

Change the cap.

Or just soak it in super hot soapy water.:thumb:

 

[wdino73]

I changed the cap, I thought about the water pump but I know it's gear driven so I didn't think u could've any trouble with it, is there a way to check it cause it's a job to change it....

 

[THEFERMANATOR]

You could have spun the impeller off the water pump.

 

[DIESELMAFIAPER.LB7]

x3 water pump there not to bad bout a 1 hour to get . tear it out and check it out bud :thumb:

 

[wdino73]

Ok thanks guys, when I get time to take it off, I'll let u know what I find thanks again

 

[THEFERMANATOR]

First thing I would do is rule out combustion leaking by. Start it up with the cap off and look for air bubbles would be my first check. Knowing an LB7, there is a good chance an injector cup is leaking. If no air bubbles start out of it then I would say definately check the water pump for a spun impeller which is also a fairly common issue for the DURAMAX.

 

[wdino73]

I'm assuming the engine should be at operating temp??

 

[THEFERMANATOR]

I'm assuming the engine should be at operating temp??

Even at an idle you should be able to see bubbles if it's a compression leak. The dead giveaway for a compression leak is if teh radiator hose is hard after it has sat overnight.

 

[wdino73]

Ok I will check it this morning