This is always a great thread on vehicle forums and remember, pictures or it didn't actually happen.
They were in the truck when I bought it. It also had a 4.6 in it when I bought it. What I have found with Defenders is that the majority of them are fine with a 4.6 and stock cooling system, but some require an increased cooling capacity. I have a 4 or 5 core radiator (bought it used) and a RRC 11 blade fan. I can idle 5 miles for an hour on my way home from work with my a/c on in the middle of summer and it never runs warm.I did. Do they help manage engine temps at all? Having had it for a summer now, did you notice anything?
Yours is a 4.6 with air-conditioning, right?