My 85 300d's Automatic Climate Control is on the fritz. Before I started the last round of AC work, I had everything functioning correctly except for the actual AC not getting cold. I've got a factory rebuilt HVAC control module/switch panel, and a good sensor, but it's still blowing hot air all the time - even in max cool. I realize that might be mono-valve, but it's been rebuilt and was working before I did the AC work. The automatic regulation is behaving strangely (fan speed is not being controlled accurately and doesn't really seem to respond to the temperature wheel at all in a meaningful way). The auxiliary water pump works, though I pulled the 2amp inline fuse I added to it last night when I was testing some stuff with the ignition set to run. I was also filling the coolant at the same time and hadn't run the engine yet, so it sounded like it was trying to push air through.

When we were pulling the evap housing out, my friend accidentally dropped the bracket with both the electronic regulators attached that normally lives above the glove box. Does anyone know the functions of those two boxes? I don't have them handy, but I believe one is temperature regulation and one is fan speed - does the fan speed unit actually regulate the automatic fan speed feedback circuit, or does it just act as a series of relays for the temperature regulator unit and/or control unit? I have spares for both units, so this is more out of curiosity, since I'll just swap both units.

Also - any recommendations for grease for the blower motor's bearings? That's one original part of my system that works well, but I did notice driving today with the kick panel off that it's squeaking a bit. I might as well try to fix that and save headaches later on.

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'85 300D - federal spec, built in late 84. 85 300D Complete AC System Rebuild