Re: Wet passenger footwell
I had a similar prob with the Volvo 440.
I got in the other day and it was steamy as hell. The blowers were not budging it so I ran my hand down the side of the seat to the carpets and urgh, soaking wet.
It has not done it since, and the only thing I can think it could be is because I hadn't used the car for a while and it had been lashing it down. I recalled that when I opened the door, there was quite a lot of water draining out of the holes in the bottom of the door. I think that a lot of water had built up, sufficient to cause the pressure to increase a bit and push it past the door rubber seals.
Could this happen in the 156?
BTW if you have access to a garage and dehumidifier, put the car in the garage and the dehumidifier in the car with the windows shut - bone dry in a day or two. Probably a weekend job or several nights.