Most likely cause on a old vehicle like this is head gaskets ,they perish with old age and disintegrate ,i mean its 15 yrs old and only designed to operate for 10 yrs
But how do I bleed the thermostat?
you shouldnt need to bleed it just fill rad header bottle then run engine and it will drop level ,then top up and then turn off engine ,allow to cool then top up again and it should be right ,if when warming up engine and it starts bubbling then its the head gaskets ,you will not see oil in water or water in the oil just pressure in the header bottle ,I dont want to sound like a know it all even after 40 yrs repairing trucks and everything else and iam still learning but unless its a 60s vehicle with a copper head gasket then a vehilce 15 yrs old will start suffering from gasket fatigue ,like they need a new wheel bearing or a clutch or when you get old things happen like knees and back pain well motors are no different .
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Fig. 1: A thermostat can be tested by placing it in a suitable container filled with water, and heating the water with a hot plate while monitoring the temperature with a thermometer
Fig. 2: The thermostat should open when the water reaches the correct temperature
Fig. 3: The coolant bleed screw is located near the thermostat housing on Odysseys with 4-cylinder engines
Fig. 4: Always install the thermostat with the small pin at the top. The rubber thermostat seal is installed around the thermostat
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