I few weeks ago I noticed my 97 accord starting to heat up when the car is at a stop. I have checked a few things and replaced the thermostat, and I now notice that when it is doing this the fan fails to turn on while the car is running. If I turn the car off or turn the A/C on both fans turn on. Are both fans supposed to run with the A/C? Does anyone know what to look for (wiring, relays, temperature sensors)?