Quote Originally Posted by AndyG View Post
Try running without the under engine plastic tray.

I removed mine years ago mainly to aid the view of any liquid leaks.

I understand it was fitted for something to do with high speed running. As I rarely exceed the NLS by much for any length of time I have not had any problems.

Without it it would allow the air from the rads escape.
Problem is that hot air rises. So when the car is parked, hot air will always travel to the bonnet and not to the underneath of the engine bay,
You may get a little more cooler air depending whether it's windy outside when parked up.