You can use your key to control the windows and sunroof (if fitted) to let the heat out.

Just aim your key at the driver door handle and press and hold the unlock button. The windows and sunroof will open, letting any trapped heat out.

You can close them up again by aiming your key at the drivers door handle again and pressing the lock key.

If your Mercedes-Benz is a roadster or cabriolet, this method will open and close the roof.