Noticed similar traits on my series 5 particularly when the car is stationary, the temperature from the heater climbs / a/c temp increases. Checked the sealing between air box and bonnet and exactly the same condition exists as mentioned above with a 15m/m gap between seal and bonnet. In addition, the bonnet louvres are 50 m/m wider each side than the air box so impossible to fully seal against the bonnet even if increasing the seal height. Is that also the same on the series 1and 2?
Ron
