Question about 2004 Saab 9-3
By turning on one of these systems you are putting more load onto the fan. Consequently the fan start to shudder under the load therby making the noise. This becomes more noticable as fan bearings become old and worn out. You could try and inject white lithium grese onto the fan shaft some of it might reach the bearing. Also check that the fan is not chipped under load that will start to make noise. sometime fan blades sofer from stone damage consequently chipping the fan blades
Posted on Jul 01, 2009
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Posted on Jan 02, 2017
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