Quote Originally Posted by MJP74 View Post
Has anyone tried one of the cooling system cleaning additives with this problem? Supposedly clean the rust and gunk out of the radiator and motor. I have done the following and still have an overheating issue when towing:
Thermostat replaced, radiator cleaned and tested (twice), water pump replaced, fuel mix checked and adjusted by the guys who wound it up (also have a larger exhaust fitted by them), viscous fan hub and fan blades replaced, Silica added to the viscous fan hub. Then replaced the thermostat and radiator cap again with Nissan parts just to be sure (76.5 degree thermostat) and added a water temp gauge to check the temp rather than relying on the cluster gauges.

Running out of options and looking for any words of wisdom!
You should install an Exhaust Temp Gauge (pyro) and a manual Boost controller and then have it dyno tuned professionally. You should avoid towing in 5th and avoid towing at 2000rpm. Better to change down and rev at 2500rpm. The TD hates 2000rpm.