I am late to this conversation, but I - quickly - read over the responses and am in agreement with the suggestions put forth. However, I gotta ask a dumb question here…. Which engine is having the overheating problem? Is it either of the gasoline engines or is it the diesel engine?
Also, has anyone discussed the possibility that the radiator and A/C stack may be clogged from the outside? I have seen debris build up in radiator-A/C condenser/CAC stacks before that have caused overheating problems. The fix is to take the stack apart power wash the individual cooling units.
Another thing to consider…. HOW is the engine overheating? Does it overheat simply by slow speed, low load conditions, or does the overheating occur only when the engine is running under higher loads, like high speeds, stop and go traffic in high ambient temperatures or towing?