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What fan you running mark?
When I done the partial rebuild on my cooling system I found the front thermostat housing corroded badly. Thanks to our glorious leader having one off his old block with the hole in the side I replaced it with a perfect one.
Also new radiator. Dt79a thermostat with the circlip or might of been 2 under it.
Quickaz fan and on the beech in tassie (first beech and driving I had done in it) was perfect.
But then I followed rosco through a mudhole and clogged up radiator for the next beech run. Just ask Darren how that went lol.
But overall I think the quickaz fan made all the difference. Like the thermostat it's kind of pre-empts the situation as the fan hub never fully releases. It's always drawing some air. Is a bit noisy when on the loud pedal but 100% worth it in my eyes