I have Honda Pilot 2003 with 270 thousand miles. Now had Transmission problem and I found out it work fine when Transmission temperature below 130F but as soon as increase more than it start failed to shift to 3rd gear and always got error p0780. So as last resort I am thinking lower temperature on Engine. Currently average temperature of engine 182F. Actually I did make one modification and before that if idle temperature can raise to 205 F which at the time the fan will blowing if AC not running. The modification I made is to use bayite DC 12V Fahrenheit Digital Temperature Controller 10A 1 Relay with Sensor which I install the temperature sensor close to coolant temperature sensor. The temperature detected will be around 30F lower than coolant temperature so I calibrate adding 9F and I set the fan will turn on at 165F which will turn on the fan at 180F WTF. Maybe my thermostat is bad because the fan switch A even after I replace will never activate the fan at 195F because the temperature at switch is around 20F below coolant temperature sensor. SO I am thinking lower the engine temperature by using thermostat which will active 10C below standard activation temperature 78C. So I tried to find thermostat that will activate at 68C instead of 78C but I want the good quality like AISIN. I also will install Transmission Cooler Hayden 769 and Power steering cooler Hayden 402 (It actually smaller Transmission cooler). I wish I knew the problem of Pilot transmission long time so I will install Transmission cooler when I bought used around 90k miles. But now at least after install transmission cooler it still had problem I will give up. Did anyone ever use lower temperature thermostat in Honda Pilot 1st Gen?