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The drain hoses on this car exit straight out the bottom of the heating/air conditioning box, through holes in the transmission tunnel, and onto the ground. I don't believe it's possible to see or access them without some dissasembly.
The hoses themselves are made of flimsy, insulated foam. They will most likely instantly disintegrate when you touch them. I replaced mine while the heater box was out of the car (for a/c evaporator replacement) with lengths of rubber hose purchased at a local big box home store. I think 3/4" was the right size, but am not certain.
For two reasons it seems unlikely to me they are blocked. First, there are no turns - the drain hoses dump straight out the bottom of the heater box, through the firewall, and onto the ground. (Well, more like onto the transmission, but who's counting.) There are no turns in the drain hoses, unlike other cars I've seen have clogging problems. Second, the hoses are relatively large diameter - this would seem to help prevent clogging.
You *might* be able to see the drain hoses by removing the ashtray and looking under the heater box. They can probably be accessed by removing the carpeted side panels of the center console. Might even be able to see them from under the car, looking up by the transmission - but I doubt it.
Attached photo shows my 124 wagon disassembled for evaporator replacement. Red arrow indicates the passenger side drain hole - there's an equivalent on the driver side. Note position of the gearshift lever for reference.
- JimY
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