Never heard of before, and around here we also got lots of 99/00 with Cobra bull bar with lights, never seen them brake down, or due to That,
I mounted my 5or6" hella's behind the grill, didnt affect the temp a tad, and the fact That they overheat in Skandinavia Are not very high, we have 6months Winter, and in. Summer it nearly Max out at 25-30deggre C/77-86F
What Are Those actuall changes in the cooling system, fan setup?
Just saying, first time heard, never seen it, but i might be wrong.
The problem was the cooling fan, they fixed it on later years by putting in a hydraulic fan that is connected to the powersteering.
Found this text from ARB:
Due to insufficient engine cooling on 1999-2000 Jeep Grand Cherokee WJ models built in North America, ARB cannot recommend their Bull Bar (3450090) for this application. The problem lies within the early model's cooling system, which utilizes a conventional fan and fan clutch. With this configuration, the early WJ is extremely sensitive to
changes in vehicle rake, ride height and air flow, which have proven to cause a significant increase in engine operating temperatures.
Chrysler rectified this problem with the introduction of an upgraded cooling system on the 2001 and later Grand Cherokee models. The new system utilizes a hydraulic fan system that runs off of the power steering pump. ARB is pleased to announce that there have been no cooling problems reported with this combination.