How to better Vent T4?

[Sunny43.5]

Hey Guys you are all right , when I sold [or should I say wrote off my T4] back in 2005 I bought the then new T5 a bit dissapointed with 2 litre compared to the old 2.5 petrol , but after having a fully built in style sunroof in the front section and an electric "spoiler " style sliding roof in the rear I was dissapointed that the T5 has only one smooth section for a sunroof in the front . I don,t use aircon much and used to love opening both roofs for the fresh air experience . So now days I still have a fully built in style electric sunroof in the front section but sob sob no rear roof [ curses on VW ] (I can get a reasonable air flow if I lower the front windows but I have to wear a cap or I end up looking like the wild man from Borneo !!!!!! . I don,t like these vents that are on top of the roof as there is a risk of smashing them on some low underground parking and they look like crap , plus the whirly ones are notorious for wearing out the bearings and getting very noisy {yes I used to fit these when I had my other business years ago } . I still havent given up thinking about some way to vent the rear but it has to look the part , if I find something I,ll let you all know , I,ll post a photo of our van with the roof in when I get round to it . Howard

[irsa76]

Those whirly vents normally work fine, I have noticed some have a brake on them for when you want them not to vent. Could be worth a look if this is the case, or if they are simply not installed correctley. As for the sunroof option, I belive it IS actually possible to install a rear sunroof, just not very easy to seal it due to the ridges on the roof. We're currently looking into a future van purchase to carry the soon to be purchased dog and the ventilation issue is one we are very concerned about. To the point so far the Kia Grand Carnical Platinum is favoured due to it's sunroof+fully opening side windows and rear vent windows!

[GlowPlug]

The sunroof option looks great! I worry about making the roof weaker by cutting bigger holes into it etc.

The whirly vents are installed correctly, BUT I did not have them flush to the roof lining, as suggested I have now fitted a cover to block the gap between the roof and head lining. I have tried to test it out with the tissue/paper method, problem is I can't see down the back!
Hopefully over the weekend I can find someone to sit back there to watch.

I wonder by filling the gap and if i fit a fan pushing the air up to the vents that it will vent better?

[GlowPlug]

So far so good, it's cool so will have to keep an eye on it when it gets warmer and see how it's holding up.

Thank you for all the advice, its' greatly appreciated.