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I have a 99 GST. When I use my heater it makes a really loud noise. I was pretty sure it was the blower motor but what's confusing me a bit is that I can hear the noise outside the car just as loud. Any ideas? By the way outside the car it sounds like the noise is coming from the passenger side cowl area.
 

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It's likely your blower motor - they have a tendency of collecting leaves, debris, or mouse nests if you never clean them out. The reason you here it from the outside too is because the HVAC system has a port that allows air to be pulled from outside for fresh air when the air is on and the port runs under the plastic cowling. Pull the blower and see what's in the blower cage. I would start there.
 
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