l3400 antifreeze leak

   / l3400 antifreeze leak #11  
Well it is leaking behind the frame. Not much but enough to notice. Trying to figure out if there is a frost plug behind frame that could be leaking. Does anyone know if there was a stop leak put in antifreeze prior and when I drained it that stuff is gone and hence why it's leaking?? If so should I try some stop leak?
 
   / l3400 antifreeze leak #12  
Not sure if these will help...
 
   / l3400 antifreeze leak #13  
If you have a photo that would show engine block to right of the radiator photo that would help greatly!
 
   / l3400 antifreeze leak #14  
These are the best I could find...
 
   / l3400 antifreeze leak #15  
Thanks - that one photo does help slightly it appears to show a frost plug I am hoping that's leaking .
 
   / l3400 antifreeze leak #16  
I am not a fan of stopleak. Fix the problem, dont band-aide it
 
   / l3400 antifreeze leak #18  
I had my dealer install a block heater about 2 months after I got a new 2005 L3400. When I got it back I had a coolant leak between the frame and the block. I could not see where it was coming from and then I saw that there is an area there where coolant could have leaked in when the heater was installed. I jammed paper towels down there and suck up a bunch of coolant. After about a week the leak stopped and never came back.

I suspect you may have the same issue.
 

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