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Thread: 348/355 HVAC air route

  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.

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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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    Modificato is offline Nowhere to put the shopping -The Ferrari F40 Club Member
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    Suffered chronically with Hayfever as a kid to the degree that it seriously hampered every day life.

    Found out through lots of different tests and medications inc. injections every season that my problem was two fold.

    They believe that Hayfever comes from an ancient mechanism to trigger migration - if I go on holiday it almost always disappears.

    Second I used to take tablets to 'treat' the hay fever - working with a pharmaceutical company that makes them I learned that will not work for me.

    I need to start taking them before the season starts - two or three weeks before and then take them daily until the season is done - for me this is April to October as my allergy tests showed late summer tree fungus is a big issue.

    Moving across the country and to the city helped but the antihistamine regime works like a charm. Just too bad I didn't find this out whilst I used to suffer through 'exam' season as a kid.

    Boots own brand in packs of 30

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    I didn’t really get it as a kid, started late teens and since then it’s been a pain.

    Weird thing was until 2 days ago I hadn’t had a single smidge of it this year which was the first time in 30 odd years. When I say not a smidge I mean nothing and considering we have a small wildflower meadow which I’ve been cutting it really was amazing. Only difference this year compared to others - having ‘long covid’ and for some reason it seemed to have some sort of effect to the point I hadn’t even had a tablet whereas I’d normally have been having them from March.

    Went out in the car driving along roads lined with ‘cow parsley’ past fields of oil seed rape and long grasses with the low nose of the 348 funnelling pollen through the vent and as it turns out with no pollen filter directly into my eyes, nose and throat and my body suddenly remembered it suffered from Hay Fever.

    Anyway, hopefully I can rig some of this pollen screen across the intake and it should help. Maybe a bit of a gash ‘fix’ but should do the job.

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    Do you mean something like this...???

    https://www.ferrarichat.com/forum/th...filter.540852/

    Not sure I would be 100% comfortable about doing though. Lot easier to just shut or redirect the vents away from your face.

    Alternatively why not make some supports so you can drive round with the car still in its air chamber?! ;-')

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    Quote Originally Posted by irarref View Post
    Do you mean something like this...???

    https://www.ferrarichat.com/forum/th...filter.540852/

    Not sure I would be 100% comfortable about doing though. Lot easier to just shut or redirect the vents away from your face.

    Alternatively why not make some supports so you can drive round with the car still in its air chamber?! ;-')
    Morning Jeff.

    I'm afraid with hayfever and the amount of pollen around me at the moment out here with field after field of crops kicking it out just directing the air away from your face will have some but very little effect - you'll still be blowing it into the cabin. I could just shut off the air but on a hot day it'll be fairly uncomfortable after a while.

    I'd seen that thread and like you I'd be reticent to shove something too far down into the box although it does look like a neat solution and at the end of the day I’ve really got to do something. A pollen screen over the top should work almost as well while being much less restrictive and easy to remove once the pollen levels drop later in the year. It souldn't massively effect air fow particularly when driving as there must be an over pressure coming through the bonnet vent when compared to standing still.

    Re driving around in the bubble, it does inflate off the car battery if the 240 supply fails and filters the air going in so maybe it's an option
    Last edited by Nosevi; 12-06-2021 at 07:13 AM.

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