Hey, just discovered a leak on the passenger side of a RHD 85 Carrera. The water seems to come in through this hole under the dash on the passenger side when water is applied near the right hand side of the windscreen, (i.e on the drivers side wiper). Anyone know what it is?

 

Looks like the vent drain. Can you take a pic from a bit further back?

 

possible vent drain or possible winsheild seal, which there known for espiecaially newer ones 993

 

First, you must move the steering wheel back to its proper position.

Seriously, is this a coupe or a targa? Targas leak in the most unexpected places.... (water follows the path of least resistance, so where it leaks out is not necessarily related to where it leaked in!)

Also, failure of the windshield seal is common on older cars like this.