Hi guys got a 1998 TDI 110 bhp se. when i get out of the car after a drive i get hiss from the front end, after i turn the engine off. lasts for about 30 secs. it sounds as if some thing is decompressing. First turbo car iv had and the first diesel, is this normal?? any1 with any ideas i would be graetful.:confused: it does have A/C could it be that???