I'm attempting to replace the heater core in my '91 Passat GL. Have removed the dash without too much trouble, but now staring at the black housing that contains the heater core, AC condenser, and circulation fan. I haven't the foggiest idea how to get into it. The VW manual I have is completely useless in this regard, but suggests that I need to evacuate the AC system even if I'm just changing the heater core! (They're kidding right?). This is the same manual, by the way, that explains how it's necessary to drill out the steering column shear bolts to remove the dash! Glad I didn't try that one!
Anyway, If any of you have accomplished this daunting task I'd like to hear from you. Thanks in advance.
Ken