It could possibly be a clogged heater core
Had the same problem on my 1991 accord. Replace the thermostat, gasket, and radiator cap. Also, get a gallon of coolant if your current coolant has been in there for more than three years. The thermostat is in the engine block. Simply drain coolant, remove the radiator hose from the engine - the hose that goes from the bottom of the radiator into the engine. There may also be a small spount that bolts into the block, remove the bolts and there is the old thermostat.
Trouble code P0128 means: Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)
If it is a V6, the cam belt, water pump, spark plugs, coolant, and thermostat, should have been replaced at 110,000 miles. If you have not done so, know that this is an interference engine. If the belt breaks you will have engine damage. If it is a 4 cylinder the spark plugs, coolant, & thermostat need to be replaced. Have brakes and suspension inspected.
Every time you change the coolant.
Not necessary to drain all coolant, just enough to be able to remove radiator hose from thermostat housing and prevent much leakage.
The 1988 Honda Accord coolant temperature sensor can be found on the front of the engine. The coolant temperature sensor will be a few inches above the thermostat housing.
the connector is corroded
Check thermostat make sure fans work replace coolant easily done check manual
THe reassembly didn't go well. A failed seal, a cracked hose or similar.
Any sign of overheating, just replace the thermostat. On a 8 year old car it should be replaced and the cooling system serviced.
Where is the thermostat located on a 2002 Honda accord LX
Low of coolant, thermostat is stuck closed, radiator is clogged, cooling fan is not working, or blown head gasket.