I have a 2002 Honda Accord 3.0L EX V6 with about 392,000+ miles. My sister drove the car and called me one day that the car overheated and she’s near the house. Told her to just drive the car home. The following day, checked the car and found out that one of the rubber hose has a leak. Replaced the hose and replace coolant using Radiator Coolant Filling Funnel Kit (you can see the coolant bubble come out). Run the engine for about 20+ minutes constantly checking the temp gauge. The gauge was normal, no coolant leak. My sister drove it to work and called me that the temp gauge was going up. Told her to bring the car back. Let the car cool down and checked the radiator and other leaks. The radiator is full of coolant and no leaks. Changed the thermostat (Honda dealer thermostat – expensive) and replaced coolant. Turned on the engine and let it run for about 30 mins. The temp gauge was normal. Drove the car for over five miles and the temp gauge started to go up but slowly. Turned back home. Changed the coolant temp sensor and repeat the process but still the temp gauge goes up when driven. The two cooling fans both works. Since mileage is close to 400K, I told my friend to replaced the timing belt (Aisin Timing Belt Kit with water pump) and told him about the overheating problem if he can check it out. He called me after installation that the car might have a cylinder head problem. Since it’s a V6 engine, he wanted me to replace the engine with a use one which is easier to do. The car runs fine, no engine smoke, no coolant in the motor oil (use Valvoline full synthetic oil) it just overheats when driven. Told him to check the cylinders compressions to see which cylinder(s) is/are defective and just replace the side with cylinder head problem. Just need advice what’s the right thing to do. Thanks!
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