Corsa Fan

[picker]

The cooling fan on my 04 1400 auto Corsa is running even when just started up.Is their a thermostat i can check and change myself.

[chas2008]

unlikely to be a t/stat when just starting up...more than likely a sensor.

[picker]

CHAS where would the sensor be?

[AlBags]

Pretty sure the ECU runs the fans on that .. but otherwise it will be a coolant temp sensor on cyl head and maybe one too on thermostat housing. Try replacing the thermostat housing sensor first .. then if that fails you may need to get it on a machine to read. The other sensor signals the dash display I believe.
This was on the Corsa B .. yours 'might' be different being '04, so check around the engine.

[chas2008]

the ECU does run the fans but it picks up the signals/voltage from various sensors..

[AlBags]

One temp sensor does the ECU. The other does the gauge.