Overheating woes

[Hairyman]

I ran the van today with the grill off to see how the radiator is doing.  I got the most annoying outcome: the overheating didn't repeat itself...  I probably didn't put it under enough load, but the radiator heated up pretty evenly and the fan came on at the normal indicated temperature so some parts of the system are working fine.  I dropped the spare wheel and checked the back of the fan shroud and shone a torch through the radiator to check for debris clogging the air holes between the corrugated metal fins but that was fine.

I have too much stuff in the back to open the engine lid but once I clear that I'll have a look at how the hoses and temperatures are doing in there.

Thanks for all your suggestions so far.