Fans wont turn on

[firebirdcrazy]

I have a 2003 Chevy Malibu that I am having problems getting the fans to turn on. All the relays and fuses are good and I can turn the fan on using the OBD 2 Computers. But they will not turn on by themselves when the engine gets to temperture. Temp Switch has be changed, new water pump and thermostat. I am stumped any suggestions?

[chrisfrom nj]

Did you run a power switch to see if the fan is good did you all so check the relay

[BonzoHansen]

I have a 2003 Chevy Malibu that I am having problems getting the fans to turn on. All the relays and fuses are good and I can turn the fan on using the OBD 2 Computers. But they will not turn on by themselves when the engine gets to temperture. Temp Switch has be changed, new water pump and thermostat. I am stumped any suggestions?

what do you mean you can turn the fan on using the OBD 2 Computers?

[PolarBear]

Does the ECM see the temperature of the engine? Just because you replace a part does not mean the part is good or is working.

[The_Bishop]

^^What bear said. What does a scantool show the coolant temperature as?

[greenformula92]

Did you disconnect the battery when you changed the sensor?

[firebirdcrazy]

All the relays and fuses are good. Using the scanner I was able to turn on the fans at all speeds. The Car had overheated due to a leaking water pump so I am not sure if this car has some kind of safe mode Feature. Im thinking a problem with the ECM

[BonzoHansen]

does the ecm read the cts temp correctly?

[firebirdcrazy]

does the ecm read the cts temp correctly?

how do you mean?

[firebirdcrazy]

Your right the gauge is up at 205 degrees but the scanner is at 95 degrees, Whats going on with this?

[firebirdcrazy]

I reset the ECM and BCM seems like its working now geez. The most stupid things cause the biggest problems!!