Hi all, I know someone in here will know this. After having to use a squeegie on the windows to make the services today, I have the particle/pollen filter in the heater, whilst waiting for a new one. After doing this the cab is pressurising of all things. Now short of opening the windows which causes a popping sound as the cab roof pops back to shape, is there a outlet vent that needs clearing? I’ve removed the covers from the rear lower interior of the cab and they are clear. I’ve looked under the cab and cant feel any air flow except for some very small openings on the edge of the skirt above the wheel arch to the rear of the door. I’m sure there must be more.