Ever since my radiator was taken off I get a weird hissing noise when I stop the car after short runs. There is also a louder than usual noise when idling during these short runs. When I open the bonnet the hissing is coming from the centre of bulk head where 2 pipes (hot) feed into something. Anyone got any ideas????????

1998 A4 1.9TDi Avant - 207,000 miles

 

Probably your air conditioning (normal on shud down). Turn off the AC and see if that makes the noise stop.

 

yep my car does it too, its the ac