Before you get too far into it, get yourself a copy of RAVE and make sure you swat up on it, particularly the ETM and the HVAC sections.
These vehicles aren't as clear-cut to work on and you may find yourself going back and forth between subsequent MY's on RAVE to ascertain exactly what component is exactly where in your vehicle. Particularly with regards to the relays and fuses and harness routes for various options.
The HVAC is not what I'd call overly complicated, but it is a huge PITA to replace the heater matrix, because of where it is located.
If you are about "restoration" then only a 100% replacement is going to suit you. If you are about 'improvement' then absolutely consider the replacement of the HVAC setup with an aftermarket unit from vintageair or the like. Neither way will be cheap, I haven't found the best solution for me either. I have seen others use vintage air and some replace all the factory stuff.
One thing I am certain of, is that the softdash redesign is a more efficient setup and a much better cabin layout for distribution etc. However it is such a huge undertaking to implement that it really would be easier to own a later model or buy a disco.
Whichever way you decide, it's still important to have a copy of RAVE and a CO2 extinguisher to hand when working on these things, especially at the outset, so you reduce the frustration levels to the least 'explosive'. the RRC has interesting and inventive ways of turning gentile placid men into rage killers. turning the CO2 extinguisher on yourself can also be beneficial when you get hot under the collar
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