2013 ZD30 CRD temperature rising when towing in heat

[BillsGU]

I always keep an eye on exhaust gas temperatures and change gears down and keep revs up. Exhaust gas temp I could keep right down to 400 or 500 degrees easily but the engine temp was hot even when exhaust was not. I would hate to tow something heavy I just don't think it would have coped.

In that case it could be a coolant system problem / blockage or a fan clutch.