I have a 1999 Suburban K1500 (5.7 liter Vortec) with 130,000 miles
that has developed a leak around the upper oil cooler line fitting
where it enters the radiator on the driver's side. A mechanic replaced
the fitting and line claiming the the line had a pinhole in it but it
is still leaking. Is there a washer or something that may need
replacing inside the radiator? If so, is this an easy fix (just remove
the fitting, replace the washer, replace the fitting and refill with
coolant)? Or does the radiator need removed and/or replaced?