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Woober Goobers!
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Some of the earlier cars had the Sun Load Sensor wiring in the harness even if not equipped with it. By earlier, I mean prior to 2002 vehicles.

I'm going through the document you sent and I wouldn't even attempt this hack job myself with my experience on LH cars. I'm guessing the "Mode Select" wiring is the lower dash harness to what would be the Blower Control Module but can't tell from the description or crappy pictures. I'm also thinking that document assumes you have a good chunk of the ATC wiring salvaged from a yard car. Otherwise you'll be splicing wires all the way over to the BCM fro the ATC head, etc.

Good luck with the project.
 

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Woober Goobers!
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It would be best if you could find the Lower Dash Harness for an ATC car with the Blower Power Module. It would be plug and play at the C202/C203 connector on the main Dash harness. The rest of that harness goes to all the door actuators on the HVAC and the Blower Power Module or Resistor Pack depending on ATC or MTC. That would save you almost half of the cutting/splicing BS.

TGS has LHS car he was parting. Might have that stuff. Send him a PM.
 

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is the small pigtail harness that connects to the baffles / resister and duct sensors a separate piece from the MTC version? looks like a different resister
 

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Woober Goobers!
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Both ATC and MTC "Lower Dash" harnesses have the same connector at the center dash and all the door actuator connectors. Difference is the connection at the Blower Power module for ATC or the Resistor Block for MTC. That's why I say get that harness and the Blower Power Module from an ATC car. Remove the MTC harness and Resistor block and plug the ATC stuff in. Easy-Peasy.
 

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Woober Goobers!
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Looks like you'd still need to splice 8 wires from the newly installed ATC head over to various connectors on the BCM and Junction Block.
 

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Woober Goobers!
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Where's TGS/Terry when you need him with his "Parts Car"? heh
 

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Discussion Starter #27 (Edited)
Thanks everyone. I followed tutorials on here to salvage pins from junk yard BCM plugs and did a partial harness swap. I took everything from the big white plug immediately behind the center console over to the glove box area. I do know that the ATC system doesn’t use a resistor like MTC cars do, but my original question was meant to ask if the plug to the MTC resistor would fit in the blower control module. It doesn’t, as I found, but this was provided in the partial harness swap. The mode selector wire I spoke of earlier that you didn’t know about Ronbo, is just a plug that goes into the far right passenger aspect of the HVAC/blower box that is nearest to the factory amp and is a motor that controls some aspect of the blend door. The tutorial I was following mentioned it, and removing it, simply because you have to for the harness swap that the tutorial Peva sent me concerned. I had thought initially that this tutorial being the “hack and splice” method required no further harness components other than running new wires. It turned out to be a very unclear version of what I ended up doing. It provided no clarity in it being a partial dash harness swap, so I was really confused for a time. Everything works beautifully. Thanks to everyone on here for helping out such an old and continual question. Glad to have it done.
 

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Congratulations on your persistence in making it work.

Being as I ended up doing the conversion the “clean” way (as explained earlier, since removing the dash served double duty in allowing me to also replace the leaking a.c. evaporator), I wasn’t forced to make 100% sense out of the How-To that I sent you in my cursory reading of it. My guess is that it didn’t make total sense to me in reading it thru, and that my (apparently incorrect) assumption was that it was one of those things that would make sense while actually doing the work it describes. From what you’re saying, that wasn’t the case, and you had to fill in gaps that were left out or were not detailed adequately.

Again, congratulations. Now you can just enjoy the results and let the memories of what it took to do it fade away like a bad dream. :)
 
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