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You can test to see if it is the thermostat by running the vehicle allowing the coolant in the engine to become hot. Then squeeze the top radiator hose. You may want to use gloves to protect your hands. If you feel a lot of resistance in the hose in the direction of the engine then it is likely that the thermostat is stuck. To replace the thermostat remove the two bolts that secure the thermostat cover. They are located where the top radiator hose connects to the engine block. You can also verify if it is defective after removal by dropping it in boiling water and seeing if it opens. The correct temperature for it to open is usually written on it. They are not that expensive so it is best to use one from the dealer. Regardless, make sure it is designed to open at the same temperature. The assembly (thermostat/gasket) is number 5 in the image below. Just google part#19301-P8E-A10 coolant thermostat Honda Pilot Honda Pilot Forums
use a termo laser to check temp of coolant at filler cap ,with cap off run vehicle till you have hot heat coming out of your heater then check with laser. if it reads above 140 then you know 2 things . either the therm sensor is going bad or the temp gauge is bad , make sure the radiator fans come on ,if they do and you have good heat then you have bad gauge.
Check batry terminals are secure & free from corosion, check security of earth strap to engine & main power wire on starter, if ok have the batry load tested to ensure it can perform under load as the starter needs a lot of current. Have you tried a jump start?
Since you just replaced the thermostat and it still over heats there is a good chance you have air in your cooling system. You can find step buy step instructions on my tip and how to page. Feel free to take a look.
Check fuse No. 9 (10A) in the driver's side kick panel fuse box. But if your other gauges are working (speedometer, tachometer, low oil light, etc.) then it is possible that when you jumped the battery you inadvertently reversed the cables and created a reverse voltage. This will impact some of the vehicle electronics. If you feel this might be the case, you should test the cooling system temperature sender to see if it failed. If it did, you should suspect that the fuel gauge drive circuit located in the instrument cluster is also failed.