Hi all,

A friend of mine has just bought a new (superseeded) 4.4 sport. At around 100kph + the TX valve in the A/C systems constantly hisses. He has been back to the dealer 5 times and has had the TX valve replaced but this has not fixed the problem. Does anybody else have this hissing noise or have any remedy for him...he is going mad with the constant noise....???? Dealer says it is normal???????