Hey that air conditioning box on the passenger side of the firewall sure takes up a lot of space. If I take it all out is there a good spot to run wires through to the new ecm? I ask this because the holley wiring harness for the stealth ram is not long enough to reach down the the TPI wiring harness hole and still get over to all the sensors. Particularly the O2 sensor on the driver side header. By it's length it is clearly meant to go through the fire wall not far from the engine. They provide a rubber grummit for this. Is it fairly easy to cover the AC hole and is that a good spot? I would love to have more room on the fire wall as it is getting crowded and I still have some ignition stuff to mount. I wanted it to have a cleaner look.

 

You'll be deleting the heat along with the A/C if you remove all that - Alaska seems like a good place to retain heat! (unless this is a strip-only car)

You can do an A/C delete box which is slightly smaller and way better looking, and keep the heat - then you would maybe have the room to cut through the firewall to the side of it or below it to run your harness.

Maybe contact Holley to see if they offer plug-n-play extensions for your short wires, or thye can tell you what kind of wiring and splicing techniques to extend on your own.

 

Any threads or leads on how to do the a/c delete box while retaining the heat?

 

1) Get the A/C delete box about $100 - ebay, classifieds here, thirdgen ranch, etc.
2) remove your A/C box - there is a 2in by 2in diamond looking thing with a connector has 2 small screws holding it in - KEEP THIS and mount it in the hole on the A/C delete box - this is the resistors for your blower motor.
3) most of us had to cut into the power wires for the blower motor and attach spade connectors for the connectors on the A/C delete box
4) A/C delete box uses a smaller cage fan, so if yours didn't come with the cage fan, you'll need a smaller one from autoparts store or JY

Removal - there is one or two studs that go through from the engine bay and have nuts on them inside the pass floorboard - they are on the bottom - the rest of the bolts that hold it on the firewall are on engine bay side.

Can search "a/c delete" in the cooling section - there's alot of threads there on it

 

Thanks I appreciate all the help. Thats a very complete answer !

 

Drill a small hole under the HVAC box and route the ECM harness through it. Clean and functional while retaining the parts you want to keep like heat

Fiero blower motors are the same dimensions as the non-AC blower motors. May help your search

 

excellent. I may be able to do this without eliminating the air conditioning box yet. Looks like the cheapest I can find it is $149 online and that is without any of the blower motors ect. May just live with the box for a while. There is not exactly a junk yard where I live SE Alaska. I will have to post some pictures later today with what I have got done so far as I have had quite a bit of help on multiple threads and some people might think it is cool to see their suggestions finished

 

Mine on the bottom were bolts that were in the passenger compartment going through the firewall into the housing. No studs.

 

That may have been it - I just remember having to undo 1 or 2 from the inside.

 

Bottom 3 are from the interior. Non-AC boxes only use two of those

Theres one stud from the engine bay side. You can see it behind the #8 coil pack. Its quite annoying and often strips out requiring vice grips and a box end wrench. It can be replaced with a standard coarse thread bolt, but requires the interior side HVAC box to be removed in order to get the stud out

 

I was able to pull one of the fuses on the new wiring harness back up into the original wire harness hole and buy a few inches and make it all work. The downside is if that fuse ever blows I will have to disconnect 2 or three sensors to get to it. I printed out your alls advice and I am going to change out the A/C box later when I don't have a list of dozens of car parts that are more important to buy!