On 11/29/2004 9:44 AM US(ET), IFD took fingers to keys, and typed the
following:

I don't know about the Primera, but if it is like my 97 PU, there should
be a short piece of black hose with a downward bend sticking through the
firewall into the engine bay. Look under the dash and look or feel all
along the heater/AC air plenum between the plenum and firewall for where
it attaches to the plenum. In my PU, it is near the center hump on the
passenger side. When you find it, pull it off the plenum and be prepared
for water pouring out of it. Now, pull the hose from the firewall and
clean it out. Replace in reverse order.