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?
Thanks, Arjay