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post #16 of 29 (permalink) Old 09-15-2018, 06:02 PM
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You'll also need the connector and some wiring harness for the ATC head. That connector is different than the MTC. You'll also need the connector and some wiring harness for the Blower Control Module. Same reason it's different than the MTC.
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post #17 of 29 (permalink) Old 09-15-2018, 11:41 PM Thread Starter
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Hey thanks a lot Ronbo. Yeah that was one of my main questions was if the blower motor control unit needed a harness as well. Sort of a dumb question I guess. Looks like I will take the plunge for the $115 option that has the plug stubs at least unless the connector itself from the original mtc resistor will plug in, but needs wires rearranged to run. If I only knew the pin out..

In one of the tutorials, I believe the one PEVA provided (which seems to be the exact same instructions as what everyone has followed in the past) says to remove the mode selector wire (the one that plugs in up near the factory amp). Does this mode selector wire (the plug has two wires) need to be replaced in addition to all the other things that are obvious and/or already mentioned? I have the ATC head, the ATC plug with a few inches of each wire, the sun sensor, and still need to get the blower motor control module and figure out how to wire it.

None of the tutorials mention the sun sensor so I have to figure out how to install that and hope a wire is laying beneath it inside the dash.

Peva mentioned to check and replace the evaporator if it is leaky, but I have no idea how to know if itís leaky. Perhaps this just means the puddle of water that forms on the ground when the car is idling?
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post #18 of 29 (permalink) Old 09-16-2018, 12:31 PM
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i don't have a clue what you're talking about. I don't have those instructions so I can't verify what it says needs to be done.
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post #19 of 29 (permalink) Old 09-16-2018, 08:43 PM
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Here ya go....only $299.84 +Tax/License/Doc/Shipping!

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post #20 of 29 (permalink) Old 09-16-2018, 08:44 PM
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I found the file I sent you, and it is the correct one.

I think some clarification is needed on the two methods. Ron already covered much of it earlier in this thread.

The "clean" method requires pulling the dash to replace the instrument panel harness with one from an ATC vehicle. The extra work in that method is in removing the entire dashboard. As Ron pointed out, the reason to go to all the trouble is that the ATC harnesses (separate from the instrument panel harnesses) will plug into the instrument panel harness that came from an ATC vehicle - no splicing, everything will be factory.

The "splice" method adds the ATC harnesses but uses the existing instrument panel harness made for MTC. You don't have to remove the dash, but you do have to do some re-wiring to make up for the differences in the two versions (MTC and ATC) of the instrument panel harnesses. That is what the document I sent you tells you how to do.

As far as the sun sensor, I believe the MTC instrument panel harness has the connector on it already, it's just not hooked up (because some vehicles with MTC and certain accessories also required the sun sensor). After making all the wiring changes in the instructions, and installing the sun sensor, it should work. You'll see an oval outline on the top surface of the forward dash trim panel for the sun sensor to poke through from underneath once you get the sensor installed. Just drill through that oval and use a Dremel or jeweler's files to shape the hole exactly to the outline, and it will look factory after the trim panel is laid back down. If I'm right about the sun sensor connector, you should find it in the cavity where the sun sensor goes - unused until now.

The fact that the instructions list the sun sensor in "Parts Needed", but don't mention it in the wiring supports my thinking that the connector is already built into the MTC instrument panel harness - you just have to plug it in. You might have to find/buy some screws to mount the sensor - easiest if you got the sensor with the screws.

(Ron - I emailed you the instructions a few minutes ago.)


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post #21 of 29 (permalink) Old 09-16-2018, 08:53 PM
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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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post #22 of 29 (permalink) Old 09-16-2018, 10:16 PM
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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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post #23 of 29 (permalink) Old 09-18-2018, 04:14 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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post #24 of 29 (permalink) Old 09-18-2018, 05:09 PM
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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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post #25 of 29 (permalink) Old 09-18-2018, 05:53 PM
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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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post #26 of 29 (permalink) Old 09-18-2018, 06:40 PM
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Where's TGS/Terry when you need him with his "Parts Car"? heh
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post #27 of 29 (permalink) Old 10-05-2018, 01:00 AM Thread Starter
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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.

Last edited by Ididit86; 10-05-2018 at 01:04 AM.
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post #28 of 29 (permalink) Old 10-05-2018, 02:17 AM
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Congratulations on your persistence in making it work.

Being as I ended up doing the conversion the ďcleanĒ way (as explained earlier, since removing the dash served double duty in allowing me to also replace the leaking a.c. evaporator), I wasnít 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 didnít 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 youíre saying, that wasnít 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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post #29 of 29 (permalink) Old 03-07-2019, 02:16 AM
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And if you have a leaky evaporator, then would be the time to change it too (while you have the dash out).
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