I had the hi flow water pump in my TD42
when I did the cooling system up in Jan this year, I replaced it with a genuine Nissan one
biggest problem I was having was, when the EGT's went over 450* (while towing) the water temp would sky rocket up past 110* (alarm goes off at 110*)
since doing the complete cooling system it has not gotten hotter than 105* when the EGT's are up to 450
and the temp drops back to 95*-ish when the EGTs drop back to 300*
I had the thermostat replaced - was not quite right
thermostat housing
water pump - Mr Nissan original (water flow was no better with the "hi flow" water pump, but wanted to see the difference with OEM gear)
Viscus fan hub - was cactii
fan - was small cracks, so may as well while there to replace it
all hoses - mine were getting soft
all belts - they were looking old.......
back flush, and pressure cleaned outside of Rad - was new Dec2013 - lots of dirt and crap in the outside of it
re-filled with Mr Nissan coolant
for once I am happy with the cooling system on my TD42
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