Honda Car Forum

goes down when drivin

your electric fan isn't coming on, so when there is no airflow through the radiator (ie while moving) it over heats.start the car when cold, let it idle for about 5 minutes or more and see if the fan ever kicks on.

sounds like the coolant needs topped up, do it when engine cold, remove cap slowly anyway. check oil cap for sludge, may be head gasket.

Your fans have failed.

Wait are you sure it's a Honda. People seem to think it is impossible for a honda to break anything ever.Seriously, your fan is not coming on so check the thermostat, fan motor, fan switches, etc.

Buy a Volkswagen and your problems will stop.

Looks like everybody but one that responded so far is pretty much right on the money... your radiator fan is may not be coming on to keep airflow across the radiator when the vehicle is stopped. It may not be the fan though...On the thermostat housing or nearby, is an electric switch that is activated by temperature of the coolant. This switch cycles the fan on and off as needed whether the car is running or not. It can come on without even having the ignition turned on so be careful around those fans!If you have AC there will be two fans but only one associated with the radiator. The other ensures airflow across the condenser which looks like another radiator installed in front of the real radiator. I believe your radiator fan is the one on the right as you face the engine. If you turn off the AC, the AC fan should stop so that would tell you too.That's it... two parts... temperature switch or radiator fan. You could check the fan operation by unplugging it and jumpering the positive and negative battery voltage to it. If it runs, it is good. If not... well, be sure you've got good connections before you replace the fan.Here's a source though I think you can find cheaper...Radiator fan motor (item 8) $175.47USD:http://www.thehondapartsstore.com/he...=noTemperature switch (item 12) $26.75USDhttp://www.thehondapartsstore.com/he...vinsrch=noGood luck!