Originally Posted by TelePlayer
Reading some of these posts, I am seeing something about dirty or clogged evaporator cores. Does all air always go through this?
I... think so. Chilled or room-temperature air, yes. Heated air passes through the heater core (obviously), but from what I remember of dismantling mine last week, I guess it has to go through the evap to get to the heater anyway.
What does it take to inspect the evap core and clean it out?
You can peek at the upper right quadrant of it by removing the Maxifuse/Relay Center cover, then unscrewing the three screws that hold the blower resistor pack (for C61 manual-A/C cars) or electronic blower speed controller (for C68 electronic A/C cars), which sits on the top of the evaporator/heater core housing. (It'* on the center of the firewall below the relays.) That will open up a largish rectangular hole (about the size of your hand) through which you can see the evaporator.
In a week or two I'll have some photos of this, which I took over the weekend while reassembling my '93 with a new evaporator installed.
There'* also a TechInfo bulletin on cleaning it out; that may help you.