Just curious on what would be required to add the ECC to a '98 SE. The actual unit itself of course, but I wasn't sure if there is an additional module that goes up behind the dash or not.

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I cannot believe nobody has jumped on this.. LOL. This is a big undertaking and maybe not something to be done in the summer time. Here is a list, but I may have missed a few little things:

1.HVAC Control Assem (you have)
2.HVAC Programmer (near PCM.. has electronics and vacuum line controls)
3. Sensors (Outside temp, inside temp including duct work, solar sensor on dash)
4.There is also a feed to the PCM
5. Air Mix actuator is different
6. Blower Control Module
7. Does NOT use the blower relay
8.Various fuses and wiring differences

And probably need to add a degree in electrical engineering too. Too much for me.

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1993 Red SSE - Bone-Stock except for High Perf. (LOL) Power Antenna-Original Owner. Pushing 140K - It's the love of my wife.
'05 Magnum Hemi R/T "Great White" - Classic VW Beetles

I had a feeling there were quite a few components to it.

Thanks for the info!

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This was the first thing I wanted to do when we started gutting the SSE....... Pat told me that we didnt have enough time to work through it and that it probably wasnt worth if even if it did work afterwards.

So I'm set on buying an SSEi after I give my car to my Son in a couple of months, assuming I still have the cash then. It'll be supercharged AND have ECC.

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1997 SE/SSE - SE w/interior converted to SSE by "1993 SLE" on 11/26/2006 @ 136,000 miles
Mods- gutted air box, tan AL7's with matching door panels, tan dash w/HUD, CONSOLE SHIFTER CONVERSION!!, steering wheel radio controls with Pac-Swix, Panasonic head unit, Infinity Reference front and rears, Basslink 10" sub, Python 1400XP remote start/keyless entry, chrome T-stars, Angel Eyes fogs, cleared corners.... too much to mention here!