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I checked it out and everything was working correctly as far as the blend doors goes.  However, the inlet side of the heater core is cold, but the outlet side is hot? I'll check the coolant level.  It's not overheating, but it gets warm.  I wasn't getting any heat this time, but I do sometimes.  

I recall there was an optional "Audio Bass Control" slider available on the 1st gen cutlass, but I don't know if 94s got it. I'm only speculating as i've never seen it one in person... but i'd venture a guess it involved some sort of bi-amp setup that allowed you to fade the sound towards the front, while maintaining some form of bass output from the woofer portion of the rear 6x9s. That would definitely require separate wiring pairs from the amp to separate out the woofer from the mid/tweeter. The normal coaxial 6x9 would only have a single wiring pair from the HU, with the tweeter portion being tied into the tinsel leads from the woofer portion.  Makes me wonder if some cars were pre-wired for it, but ended up feeding both sets of wires with the same signal on cars that didn't come equipped with it?   

I've got a correct AM/FM Stereo CD player in this car; not original as it left the factory with the AM/FM Stereo Cassette unit. There is a separate Bass control on the CD player radio but even with 2 of the 4 wires wires pulled it seemed to make no difference in the sound coming out of the speakers. The speakers arrive Wednesday so I'll be finding out in short order if I made the right move in eliminating the unwanted Vibrations.  Regarding the Retrosound R-69N, Crutchfield lists this in their description: "The single R-69N 6"x9" speaker is designed for a classic car with only one speaker opening on its dash or rear deck. The woofer features dual voice coils, each one connected to its own tweeter. Your stereo receiver connects to both voice coils, so you get a stereo mix from a single speaker. In effect, you get two 2-way speakers in one frame, for modern sound in your vintage application." This is an interesting concept if there is one speaker in the back, but since I have 2, I'm interested to see how the Infinity speakers sound with 2 of the 4 wires on either side being hooked up. Stay tuned..........      

Yeah, that makes it sound even more like the brake lights are the turn signal switch in the column... 1994-2001 Gen 1 and Gen 1.5 Turn Signal Switch Replacement | W-BodyTech Forums   But that shifting thing...are you able to turn the key and move the steering wheel? Can you shift out of park with the steering wheel unlocked but with engine off?

Any chance your Cutlass has that separate bass control slider? This might sound like (or be) a stupid question on my part....but were the factory speakers truly a dual voice coil setup, or were they coaxial drivers wired to be run off of an active crossover setup?  I ask because all of my Ws have only ever had a single pair of wires driving each rear speaker, including my 92 Cutlass.  What my cutlass didn't have was that separate bass control slider. Makes me wonder if those systems used some sort of active crossover and a separate amp to drive the woofer portion of the rear 6x9s separately from the rest of the speakers.