It is probably the blower motor itself, does it change sounds or quit when operating the fan? possible debris is in fan cage, fan has a bad bearing, or a blade balancer slip on weight fell off. remove and inspect, possibly plug fan in when removed and check for operation,while fan is removed check housing compartment for debris or foreign material laying in the bottom, check fan blade for signs of rubbing contacts or broken fins
I have that problem too i have mazda 3 2006 model when i reach the speed of 100 it sarting to make noise like a can grinding. How can i fix it? But when my car slows down or not too fast i havent heard that sound? What will i do?
Sounds like its the cage come of of your blower motor.
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