Check bulkhead drains and pollen filter , see here
24th Nov 2008, 13:57
That’s right, I've got a Vectra SRi CDTi. I've only had it what 3 months now, and when I was washing it I always lift the bonnet and clean away any leaves, and couldn’t help but notice there was water sat under there, so I pulled the rubber strip, lifted were the water comes off the windscreen, and the rubber drain plugs was blocked with leaves. I ain't no mechanic, but if the water does not get out, it will go right in the heater and into the car on the passenger side. So my advice is to keep them clean and free from leaves.
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