330d alarm keeps going off

[Joe T]

The alarm on my BMW e46 330d keeps going off. It only seems to happen when there is bright sunshine (something thats become more common in the last few weeks!). I think the air inside the car gets hot, expands and triggers the sensor.

Has anyone experienced this before?

Is there anything I can do short of taking it to an Indy/stealer?

Thanks for any help.

 

[Joe T]

Well, I tried leaving a window slightly open, but it still went off.