[AT] tractor hauler has rubbery gunk in coolant

[Cecil R Bearden]

My 2000 F150 w/5.4L ( the former drug runner vehicle ), the one that had 
a 60K mile engine installed to replace the original.  Has some rubbery 
gunk on top of the antifreeze in the radiator tank.  The antifreeze 
looks green and ok underneath, but there is a 1/2 inch of this black 
rubbery gunk floating on the top that really feels like weatherstrip 
adhesive that never sealed up.  A friend who has a lot of experience 
with used cars said it could be silicone sealant that was used when the 
mechanic installed a new water pump..    Anyone had any experience like 
this?.  I really have too much money in this thing to try to sell it 
now..  It is running fine and cool, and everything works...

Cecil in OKla











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