Hi guys, I wonder if anyone can help, my T6 is fitted with a gas Truma heater installed under passenger seat, not used it yet but may need it soon due to cooler season coming. I have a brochure which mentions removing/opening a "cowl" before starting it up. I don't know what/where to find this. Is this something like a flue, maybe under the vehicle? Not found anything in search or Google. I don't want to blow the van up!