Yet again my car seems to be a Friday afternoon job innocent The heater box seals as shown below are deep enough to seal with the bonnet. In fact you can zoom to see how they have shaped themselves to fit inside the outward facing louvres. The only gap is necessarily under the hinges.

[Linked Image]

I don't have any serious issues with heat in warm weather although the huge gearbox does transmit some. From what part is visible the lower flap seems to seal well with control set to cold.

With suitable depth closed cell foam and maybe some tweaks to heater box' flaps any car could seemingly be sorted similarly.


Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone