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  1. #1
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    Default 348/355 HVAC air route

    Morning all.

    Wonder if someone can give me a hand and save me taking up the front boot compartment on my car to help me answer this. I'm looking to establish the route the air takes which goes through the cabin blowers and into the the cabin. My understanding is this but I've not checked so really don't know:

    The air goes in through black 'slot' just below the windscreen. The opening low down in the front bumper on the driver's side (on a RHD car) is for cooling and heat exchange, it's not the air you end up with in the cabin:

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    The air then goes down through the air box under the front bonet and is diverted to either cool it or heat it depending on the settings on the HVAC:

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    This would all make sense to me but I've not really looked into it.

    Many thanks.
    Last edited by Nosevi; 11-06-2021 at 07:42 AM.

  2. #2
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    Pete,

    You are correct.

    On the 348 the bumper air scoop is for the A/C radiator. On the 355s the bumper front scoops, hidden behind the grill left and right are for the brake ducts, the a/c radiator is I believe at the back on the left hand side.

    The cabin air comes through the vent on the bonnet and through the airbox as controlled via the hvac system.

    Why the question?

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    Cheers Adrian.

    Question is because I suffer from Hay Fever. It’s normally ok but went for a drive the day before yesterday and crossed the fens and car came back with a yellow/green tinge from the amount of pollen and having had the ac blowing at me I had streaming eyes and nose and a really itchy throat the next day.

    Bit of research and there’s no pollen filter in there so was wondering if I can rig something either under the bonnet grill or on the top of the HAVAC airbox to stop or at least limit pollen going through. You can get ‘pollen screens’ for windows, sort of a very fine strong mesh so was wondering if I could use that.

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    Firstly; you drove your car????? . Think you need to start a new thread!!!

    Pollen is very high this year; I suffer a fair amount with grass pollen, do not great at the moment! Worst was having sneezing fits on the bike doing “some” miles an hour on the motorway!!!!

    You could try an old t shirt across the air box? Probably as good as anything else you can rig up; just dont expect great hvac as it will restrict the air flow a fair amount. Or perhaps get a pollen filter from eurocarparts that would “fit” on top? (They always have a sale so shouldn’t be expensive.

    Ahh just remembered, a set of tights! Should be fine enough mesh but not restrict the flow too much? Yours or the misss, we itt to her should be fine

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    Quote Originally Posted by A348W View Post
    Firstly; you drove your car????? . Think you need to start a new thread!!!

    Pollen is very high this year; I suffer a fair amount with grass pollen, do not great at the moment! Worst was having sneezing fits on the bike doing “some” miles an hour on the motorway!!!!

    You could try an old t shirt across the air box? Probably as good as anything else you can rig up; just dont expect great hvac as it will restrict the air flow a fair amount. Or perhaps get a pollen filter from eurocarparts that would “fit” on top? (They always have a sale so shouldn’t be expensive.

    Ahh just remembered, a set of tights! Should be fine enough mesh but not restrict the flow too much? Yours or the misss, we itt to her should be fine
    I do drive her every now and then!

    Looking at using some of this, just held over the airbox with some elastic. Nothing particularly fancy but hopefully just stop most of the pollen and be easy to remove to clean off.

    https://www.amazon.co.uk/tesa-Pollen...51183808&psc=1

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    Looking at the air box / inlet for the HVAC I could perhaps just cut it bigger than this, maybe put the edge trim screw through it to hold it roughly in place, and I think the foam around the inlet 'seals' against the bonnet lid and so it should work fairly well as a temporary 'pollen filter'.

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    You'll know if it hasn't if the next thread is 'How do I open the HVAC in order to remove a mesh screen?'..........

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