Rep Power: 0

Is the radiator cooling fan supposed to run while the AC is on? My cooling fan is developing a tendency to come on late, and it doesn't come on when I turn the AC on.

The AC's fan comes on.

Just looking for a confirmation that the cooling fan on a '99 Civic should be on as long as the AC is on.

If it is supposed to be on while the AC is running, and it isn't, might I be looking at a bad relay?

(I've already replaced the thermostat, the fan switch, the coolant sensor, and the radiator. The fan works--I've tested it to the battery, and I've also jumped the ground connection to the fan switch. The fan just doesn't seem to turn on when it should.)

 
Rep Power: 214

Are you running hot or something. I dont think the radiator fan is suppose to run the hole time the ac is on. The ac fan should always be on with the ac on though.