Honda Del Sol recently started overheating. Radiator was not recently changed. Ran engine and checked hoses to radiator to ensure thermostat is working. Hoses felt hot. I believe thermostat is fine. Tested fan motor, working. However, fan does stop while temperature gauge continues to rise and car continues to overheat. Unsure about relays and temperature sensors. What would be the problem? Should I still get a diagnostic done or is there simple fix to this?