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In most cases, it is due to the ventilation. Ventilation duct can be cleaned or changed.
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Depending on your vehicle the "squirrel cage blower" may need the bearing/bushing lubricated or replaced, on some vehicles this is easy and some others very difficult. I have included (link below) of a typical blower.
What else can I help you with?
What is A very loud noise that begins with the letter r?
roar really loud noise
Why is your engine loud?
your engine is loud because, the fan makes that noise
What makes a loud noise when falling?
The Tai-me
Animal that makes a loud noise?
An elephant
What animal makes a loud clicking noise and a screeching noise at night?
Fruit bats.
Why does my microwave make a loud noise?
well if it makes a pop noise get rid of it fast
What makes great noise that starts with the letter c?
Cymbals make loud noise.
What is a loud noise that makes you jump an example of?
The startle reflex.
Why is it that when ever the heater comes on it makes a loud boom sound?
I'm pretty sure it makes this noise because it is warmimg up. When the hot air it is creating, hits the cold air that is already in your house, it makes a noise that sort of sound like a loud boom. I really hope this helped! ;) ;) =) =D ;P :P =P
Why an electric bulb makes a loud noise when it is broken?
· An electric bulb has partial vacuum. When broken, air rushes into the void causing a loud noise.
What insect makes a loud clicking noise in the summer in CA?
Locust
In the way to rainy mountain who or what falls and makes a loud noise?
The Tai-me.
