The climate control that I am referring to is a total manual system. You select A/C or heat and adjust the temp with a dial. Fan speed is controller via a switch.
Power to the rear blower is supplied via a contact on the front module, and this contact becomes defective. I simple "jumped" across the contact and my system has been running fine for around two years now. The only thing issue with this repair is that you must place the front module, "rear" control switch to the "off" position when you shut the van off otherwise the fan can run at all times.
To rule out the blower being bad, access the rear blower, via the access panel and put 12 volts accross the blower motor if it runs I'll bet your problem is in the front control module as described.
I really like these vans I own (2) both 1998 one 151K the other 100K on them, the Haynes manual is pretty good, it's only screwed me up once, I do all my own repairs. I presently have a problem with my rear hatch, sounds like the lock motor like you describe with your drivers door, I'll tackle it when I get some motivation. Winter is comming shortly.
Good luck, let us know what you come up with