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  1. Many years ago, I had a thermostat failure and it remained closed resulting in a significantly increased temperature gauge reading. I have forgotten most of the details except that it was an '81 Honda Accord and the engine was not damaged. The quick workaround would have been to remove the thermostat then a visit to SuperCheap Auto. Recently when I replaced the water pump, I am sure that I would have tested the thermostat [presumably original & 14 years old] before re-installing it. I am always considering possible efficiency gains and what is the best choice/recommendation for my particular vehicle and driving needs. Another major consideration is to avoid overheating and a possible blown head gasket. I started to consider what advantages or disadvantages there would be in having a thermostat with a low temp thermostat. Following internet article answered this question and I will be staying with the OEM temperature range [82C]. http://www.tuneruniversity.com/blog/2012/04/low-temp-thermostats-whats-the-advantage/ Next question was whether a high flow thermostat would be more beneficial compared to a standard thermostat. As it turned out to be, Tridon only supply the high flow thermostat TT281-180 for the Aurion [suits both 40 & 50 series]. On their website, Tridon makes the following statements: The high flow thermostat is designed to interchange with the original thermostat. Utilizing a 30% larger opening valve, the high flow thermostat increases coolant flow and improves cooling system performance. Ideal for high performance applications, or for applications where additional loads are placed on the engine. https://www.tridon.com.au/products/Tridon/35/479/thermostats-and-gaskets/528046/thermostat-high-flow https://www.tridon.com.au/PartFinder/Toyota/Aurion/Any year My most demanding application has been an interstate highway road trip with an outside temperature of 34C and the air-conditioning on its highest setting. I did not notice any increase in the temperature gauge reading so the cooling system must have been coping well enough. The radiator is the other component in the cooling system under consideration for further research.

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