Try using something like 'engine ice' or similar as a coolant. No mixing, 100% from the bottle. Also, check coolant level, the LC4 has a tendancy to lose a tiny bit of coolant, hardly noticeable in the radiator, but the few ml's make a diff. I used engine ice, top up of a few ml's about once a month and I installed a second radiator fan with the switch set to kick in about 10 degrees before the stock fan...problem solved.
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