Shudder from open sunroof

[tamper]

Driving home tonight I decided to open the sunroof rather than use the AC (it was pretty hot here today).

Anyway round about 60km/h (40mph-ish?) the open sunroof was shuddering like mad - a really annoying noise. Closing it a little bit seemed to help though.

Has anyone else experienced this? I've seen some posts outlining more serious shudders at 40mph so perhaps I should think myself lucky!

t

[Big Jonah]

Try opening the rear window a fraction.

Now the science bit (don't quote me on this!): When you drive with sun roof open, air is forced into the car increasing the presure. Once high enough, it vents back out throught the sunroof, creating the 'fump fump fump' you hear. Opening the rear window prevents the build up of pressure, and makes the drive a lot quieter.

Hope that helps

[Morr]

Driving home tonight I decided to open the sunroof rather than use the AC (it was pretty hot here today).

Anyway round about 60km/h (40mph-ish?) the open sunroof was shuddering like mad - a really annoying noise. Closing it a little bit seemed to help though.

Has anyone else experienced this? I've seen some posts outlining more serious shudders at 40mph so perhaps I should think myself lucky!

t

Check if your sunroof has two positions on the switch, most normally do (any sunroofs I've had including prior '93 surf have had this), these are normally refered to as 'comfort' and 'full', the comfort position being around 90% open to avoid the very problem you have encountered

[tamper]

Thanks chaps - I'll give those options a try.