Something in my sedan's cabin air system smells bad (organic bad, not mechanical bad), even after changing the cabin air filter.

I have a bore scope, vacuum, compressor, and hoses sufficient that I think I could find and clean out the source. But I have no idea what the layout of the system is and how it is configured in each mode – i.e., what position each damper would be in, what dimensions I'm likely to encounter as I snake through the ducts, and where each of the HVAC components sit. I'm not even sure where all of the intakes and outlets are. (I also understand that just opening the entire system is a four-figure project. Given the tools I have available that's probably unnecessary.)

Where can I find a detailed schematic of the HVAC system for a late-model sedan?

And are they generally similar enough between makes and models that one example would be enough to give me an idea of where components, dampers, and intakes are?

Or do they vary significantly enough that I would need a model-specific drawing?

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    We could do a lot better helping you if we knew what the year/make/model of the vehicle you are talking about . – Pᴀᴜʟsᴛᴇʀ2 Nov 1 '15 at 10:55
  • Right now it's a 2010 Volvo S80, but I would appreciate answers for the question as posed (out of general interest and applicability). – feetwet Nov 1 '15 at 14:48
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    The problem is, every manufacturer is going to design their vehicle differently and it's also going to be different between models and maybe even options on models might be different (i.e.: think about automatic HVAC versus manual HVAC controls). Because of this, there isn't going to be a right answer. Narrowing it down to a single model might allow us to provide you assistance. – Pᴀᴜʟsᴛᴇʀ2 Nov 1 '15 at 16:40
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    The only place I could think of would be in a service manual if at all. Those can sometimes be found on eBay, but the dealership will have one ... and they don't usually lend them out (for some reason ;-) – Pᴀᴜʟsᴛᴇʀ2 Nov 3 '15 at 23:41
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    Possible duplicate of Why does my A/C blow foul smelling air when it first turns on? – DucatiKiller Dec 28 '15 at 18:02

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