Where exactly is the draintube for the AC condensation&Is ther a cabin airfilter on 2004 Chevrolet Express 1500

Have looked in every place Ive been told it should be but cant find it. I cant find any diagrams or video showing me EXACTLY where the drain tube is located.
Also wondering if theres a cabin air filter on the 04 Express van.
Thanks in advance.

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2 answers 1 comment
Does not have a cabin air filter and the drain tube is in front of the evaporator. Stop by the shop and i will show you..
Should be by firewall close to passenger side. these does not have a cabin filter.
So I've been told many times but I've looked and felt everywhere and still can't locate it. Would you know where i might find a diagram or picture of its location?
Thanks for the reply.