fans not working but not overheating?

[rasild]

Radiator fan isn't working but the the car isn't overheating. The fans used to work all the time even when the car was idling at start up. I replaced the coolant temperature sensor that is between the engine block and the firewall not now the fans don't work at all. I rev the car high for a few minutes and the fans don't turn on.

I got a coolant leak on the the thermostat and it started spraying all over the engine bay.
I idle the car and i rev it high but the fans do not engage, unless i turn the ac on. Is there something wrong with the fans or is this normal? Which sensor engages the fans?
I am afraid the fans not working created a pressure point that caused a crack on the thermostat.

[Mike@PureMS]

The coolant temp sensor will turn the fans on. If they're not coming on it's most likely the fans themselves. Do they come on if you turn the A/C on? If no, then it's definitely the fans.

[imnuts]

Could also be the fan control module gone bad. Do the fans work if you hook them directly to a 12VDC source?

[milan2k13]

As long as the one of the two fans is working, the car will not over heat. For the longest I was running only on one fan, til earlier this year that one gave out, and my car over heated in the middle of the street.

[MikTip]

Radiator fan isn't working but the the car isn't overheating. The fans used to work all the time even when the car was idling at start up. I replaced the coolant temperature sensor that is between the engine block and the firewall not now the fans don't work at all. I rev the car high for a few minutes and the fans don't turn on.

I got a coolant leak on the the thermostat and it started spraying all over the engine bay.
I idle the car and i rev it high but the fans do not engage, unless i turn the ac on. Is there something wrong with the fans or is this normal? Which sensor engages the fans?
I am afraid the fans not working created a pressure point that caused a crack on the thermostat.

Reving the engine has absolutely zero effect of the rad fans!

They are controlled by temp sensors and come on when the temp sensor senses a very specific temp, something like 230F.

It takes time for the engine to reach that operating temp, even sitting at idle, it can take 15-20 minutes!

Just let the car idle, open the hood, and watch the temp gauge on the cluster.

The fans should come one when the temp gauge goes slightly past half-way on the gauge.

[userbob0001]

Fans turning on at startup and running all of the time is a symptom of a bad CTS. Are you sure they aren't just staying off until they are needed now that the system is fixed?