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Ford Focus TDCi 2003 - Mysterious hissing - Fat Envelope

Just bought the above this weekend.

When we parked up at home after a short drive out, there was a fairly loud hissing noise coming from the front right of the engine bay. A quick lift of the bonnet/inspection underneath showed no obvious leak (thought it might be the radiator at first) so based on previous similar questions on here I would have to assume it is either relatted to the turbo or the aircon system.

Unlike previous poster, the hissing went on for a good 10 mins after parking up before slowly dieing away (as the pressure obviously eased up)

Took it out for a few drives afterwards (with aircon on and without) to see if it re-occurred but nothing.

We did get a warrenty so I will take it back to the vendor this week but it would be useful to add a bit of knowledge to my claim for inspection/repair!!

Ford Focus TDCi 2003 - Mysterious hissing - HZ

Just noticed the same problem with my Ford Focus 1.8 TDCi 2002. There were no problem with starting up. Did the vendor figured out what was the problem? Appreciate your help before sending it off to the garage.

Thanks