Vintage air have some great products that make fitment a breeze. There's no issues remotely mounting the evap core, and running pipes to out to vents located where you want them. This is probably what you'd need to do if you mount it up behind the glovebox (assuming there's enough space up there - but they are a compact unit.

I've helped 2 mates install hidden systems in hotrods, and we put 4 vents in each - 2 in the middle just blowing downward (hidden by the dash) and one in each kick-panel that you could aim up to face level. The only way you knew they had air was the control panel on the dash, and those kick panel vents (which didn't stand out).

I've been pondering one of these for the 307 HK GTS:
http://www.vintageair.co...t%20rev%208-15%2047.pdf
I assume you'd mount it up behind the glovebox with ducts straight up to the demisters and the 3 x 2.25" ducts to outlets as Warren says - you could even use the radio spot for a vent too. They sell vents for floor level as well as the unit would be across to the left.

I guess with this in place there would be no need for the heater box anymore, so you'd just use the Belmont blanking plates and run the hoses and heater hose through these, and it'd be a convenient spot to mount the drier as well, hidden away up under the dash.

Some of the knob sets at the bottom of this page may fit the radio blank space too:
http://www.vintageair.co...t%20rev%208-15%2048.pdf

Or even the 4-lever unit may be able to be fitted where the original HK heater controls are.

I just call them that as that is where I have normally found them, rarely ever if at all seen them on 03 or 04 coded cars although as you say the heater box is an option on those.

If you contact people like Greg at Classicozwreck he'll reasonably regularly still get HQ-WB or VB-VK with a non-genuine A/C bracket to fit a Sanden unit, so if you aren't able to make one that is a possible solution. They are never pretty though, unlike the total kit Vintageair sell for a SBC that bolts straight on.

The other problem with up to HG Holden 6 cylinder is the mounting of an AC compressor in the place that an HQ on mounts is not possible, due to clearance with subframe. This is probably not a problem today due to the smaller nature of these compressors.

One other option is the use of a blue motor as the head mounts the AC, simular to the original HK to HG design.

But even VC to VH ac systems are hard to come by now.

I have been helping people with real early Holdens for a while and AC is always a problem due to the lack of compressor mounts for red motors. Have only ever found half a dozen that mount up on the head.

As Terry siad, the aftermarket AC industry has died as all new cars have AC.

Warren

Hi , we have an original 69 build 327 GTS which has been in the family since new.

In 1977 Dad had a Highgate industries- Kent Town Adelaide- Mark 4 Monitor system -sourced from John E. Mitchell 3800 Commerce Street Dallas Texas- fitted by Ackland Motors in Frome St Adelaide.

The tacho was moved a little closer to the gearstick, but other than that the under dash unit fits perfectly , it has a matching woodgrain facia,- it looks like it was made for the car- all the original deluxe heater system fitted as standard is completely untouched , 2 holes through the firewall , condensor mounted in front of radiator- plenty of room- and a special bracket made for the compressor which is mounted on the right hand side of the engine bay alongside the alternator which is retained on it's original mounts and position, with standard pulleys and original waterpump and a separate idler pulley for the aircond belt.
The unit has always worked well except for the fact that the older style compressors always use more power to drive them than the modern day equivalents.

Our car was also optioned with the tape player which was moved to the left and would probably kneecap the passenger in an accident, so we just don't hit things.

As long as the car is as original no dramas. My '57 Chev had no seat belts and was and is still registrable.

In WA a demister of some sort seems to be required regardless of what the car was originally fitted with, a 12v computer fan blowing air onto the screen was suggested to me by the vehicle inspector, thats what I did and he passed it.

If yu are not too worried about how much glovebox space you loose, one option, which I have helped with, used a VC Commodore evapourator box, which mounts near the passengers feet, and then used flexible hose to direct air to vents. I think it also had a heater in it.

Warren