Post AU and Thermofan conversion hiccup

[Bass Crazy]

Hey guys.

A few months back I did an AU engine conversion on the EA, along with the thermo fans.
I am having a little temperature issue which is starting to annoy the crap out of me, just wondering if this behaviour is normal for an E series running theroms.

Background Info.

- Stock AU engine, LPG, standard thermostat, clean new coolant, standard timing, BBM manifold, full exhaust, no water loss or signs of head gasket issues.
- Radiator is a natrad item, 4 years old, was cleaned while doing engine conversion, radiator place said it was still ok.
- Have since removed the air condition gear that sat in front of the radiator as it was not flowing well, issue is better, but still there.

Ok so if I drive the on a cold morning (6-10deg)on the freeway for about 15 mins for example, the temp will be fine and sit on about 1/4. Stop at a few sets of lights, probably 5-10 mins in total, but a bit of normal start stop driving in between, and the temp will soon find itself up around 3/4 and will continue up to hot unless the fans come on, or I start driving consistently, then it will gradually come down.

Basically, unless im doing a constant cruise speed, the fans will come on, and thats in bloody winter!!
Any stop start driving, and the cooling system struggles. What will happen when im towing a heavy load at 38deg? The thing will be useless.

I had the same sort of cooling system issue with the EA engine just before it was removed, but it only became apparent on real hot days, probably because the clutch fan has a consistent air flow, even on the cold mornings, could have been hiding the problem.

So what do you think guys, should I grab a new radiator, or is there another issue?