Autosleeper Trafic T1000 cooling

Finally got Terry back on the road and he's just coped well with a road trip from Kent, up through the length of Wales and back again. Found a few areas which need tidying up. I still think that he's not running quite perfectly despite all the usual routine servicing, so I'll move onto cleaning the carb, checking the distributor, checking the timing etc. However, he's running pretty well. The cooling was marginal on hot days on the motorway and on mountain roads. Just wondering whether that's due to the remaining minor running issues or whether its simply to be expected - he only has the 1647 cc petrol engine? If it is to be expected, has anybody done anything such as fitting a larger radiator, an oil cooler, ducting to force more air through the radiator, or similar? BTW, I've flushed the rad and it appears to be in good condition. Any advice gratefully received! Cheers, Rob

Autosleeper Trafic T1000 cooling