Both AUX fan only runs when thermostat opens??

[r. masajo]

guys n gals, i'm a bit confused regarding how the aux fan works, is it normal that both of them only works when the thermostat opens?? i'm feeling that the engine is getting hot, though the temp gauge is still normal. help..

[Binladin]

There's a problem if they come on before the thermostat opens, I haven't watched my fans so I'm not sure if both work at the same time but… if the temp gauge stays close to the middle and works while warming up you should be good. Does the gauge work right? Did you check the antifreeze? How do you know it's overheating?

[sonikaccord]

the "AUX" fan is the condenser fan for the A/C. The thermostat doesn't control the fans operation. the ECT switch does. All the thermostat does is allow coolant to flow through the engine. It is normal for your radiator fan to kick on after the car has been idling for a while.

[cp[mike]]

The main (big) fan runs whenever the ECT switch says that the engine is too hot. It is normal for the aux (small) fan to run at the same time as the main fan. This smaller fan is actually intended for the air conditioner, though - the condenser unit is right in front of the radiator, and the fan is right in front of the compressor. It can kick on when necessary during A/C operation, regardless of engine temperature.

[r. masajo]

@binladin: temp is ok, but i felt engine is very hot.

@sonikaccord & cp[mike]: they both work at the same time bro, as far as i know radiator fan should work when i start the engine, and the other fan works when the engine is getting hot or the a/c was turned on. correct me if i'm wrong..

for now i put a piece of wire into the ect to make my fan running at all time, coz i really feel that my engine is getting hot, especially now the temp here in saudi arabia is around 40 deg already.. thanks for the replies guys..

[sonikaccord]

The radiator fan should only kick on when the engine goes slightly above operating temp. The smaller fan can kick on when the radiator fan is on, but will kick on when the A/C is on.

Also, you need a quantitative measure of "heat." The body is very prone to error. If you can find an IR thermometer that would be best.

[r. masajo]

The radiator fan should only kick on when the engine goes slightly above operating temp. The smaller fan can kick on when the radiator fan is on, but will kick on when the A/C is on.

Also, you need a quantitative measure of "heat." The body is very prone to error. If you can find an IR thermometer that would be best.

That's how supposed it work, but the problem is they both kick and turn off the same time. and kicks on when i turn on the a/c. in your current set up, (i mean the factory set up of the aux fan) have you ever felt that your engine is getting hot??

what should be the temp if i'm gonna use an IR thermometer?