Air Con - weak on one side

Not sure if anyone else has air con fitted to their Td5, but I noticed that of the 4 vents, only the centre passenger side seems particularly strong? The others seem to blow cold air but nowhere near the rate of the one that works fully... Its a little annoying as it creates an imbalance of airflow in the cabin.

Is it possible they could be blocked? If so, how do you remove the front of the grills so you can unblock them?

Generally how they are. The blower fan is in the passenger foot well, it looses pressure as it gets to the drivers side.

Best bet is to close off the vent closest to the blower, helps balance the air more. When im alone in the landy i close off both passengee vents or direct vent 2 toward me.

Thanks - makes sense with where it is. Daft question how do you isolate a vent? I only seem to have directional control on the air con vents on mine??