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My 2004 saab 9-3 is making a loud fan like noise even when car is at idle. it will settle down after a little bit. However the fan runs kind of hard even when the engine is not
under heavy load
Hi and welcome to JA.com
make sure the climate control is turned off and see if the noise stops, when the air-conditioning is switched on the engine ECU switches the fans on to compensate for the rise in engine bay temp caused by the extra load,
if the fans still run with the climate off there may be a problem with the engines coolant temp sensor, if the ECU senses a fault in the circuit for the temp sensor it will switch the fans on as a failsafe to prevent overheating, if this is the case you will need to have the car checked with a diagnostic machine,
hope this helps,