Cockpit Temperatures Rising on Ground?

[artanisdg 1]

I've been flying the BCF PW model PMDG house livery for a few days now, and I've noticed that the cockipit temperature on the ground tends to rise to very high (28~29C) without packs and a/c ground unit.

 

Is it due to the heat from the E/E and Flight Deck equipments?

 

Also, the temperature continues to rise even when I open the F/D OVHD Door. Is heat escape through OVHD Hatch not modeled?

I'm also curious to what the FD Fan does. It doesn't seem to dischargee FD heated air to other compartments, and it also doesn't cool the F/D, so I'm guessing it isn't connected to an external port.

(I've tested the plane at BFI, RKSI, SEA and VHHH... OAT was relatively low. Always below 10C. When the packs come on, the F/D temperatures are normally regulated. No other bugs/problems were present.)