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Wiring diagram help. Hybrid Air Conditioning

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    Wiring diagram help. Hybrid Air Conditioning

    Many may know that the Australian delivered cars never officially came in with the excellent factory integrated AC. The local Leyland Australia group sublet the work out for anyone that wanted a hidden away air conditioner.
    It was a reasonable locally designed 'hybrid', using the lower half of the Smiths heater assembly and doing away with the upper half, including ditching the Smiths blower fan.
    It was also neatly wired up to make use of the standard factory 2 speed blower switch, powering a 2 speed (Japanese sourced) blower fan behind what looks like a Jaguar XJ6 evaporator.
    So, you couldn't easily tell by looking at the interior of the car unless you noticed the thermostat of course which had to hang out somewhere.

    Reading the 'Air Conditioning' section of the Stag Repair Operation Manual, it states that "selecting the cooling system will automatically bring in the operation of the blower units [fans] at low speed. From this condition high speed may be obtained by pulling the switch knob fully out". Got to love the 1970 wording but what it's saying is that when you slide the top lever under the ashtray to the left the fan automatically engages in low speed without having to pull out the factory blower switch. A nicely engineered touch.
    Like the factory integrated AC system I wanted my Australian hybrid systems' Japanese blower fan to turn on to low speed as well when I "select the cooling system"; in my case when I turn the thermostat knob on.
    My electrical engineering knowledge is mediocre but I think I managed to get it to work this way with a couple of relays linked to the factory blower switch and thermostat- see attached.
    Not sure if it was ideal, but I used the factory installed 'window lift circuit breaker' to power this.
    Anyhow, I'm stuck in how to wire in the 4 wires coming out of the Trinary switch...
    A Binary switch would be a very simple wiring installation but I wanted the dual condenser fans (which are mounted in the Stag Mark I position) to turn off at high airflow speeds when not needed.
    Any help would be appreciated.

    Attached Files
    Stag 2500S
    Jaguar STypeR Citroen C5

    I'm attaching the same diagram. This time showing what I think may be a likely wiring scenario to incorporate the Low/Medium/High (trinary), dual circuit 4 wire switch.
    I've never had any issues keeping the car cool in 40+ degree days when I first bought it. It had the factory viscous drive, an old serpentine condenser mounted vertically and a c1975 small condenser fan but I've never tried the car with the condenser mounted in the 'Mark I' position. Which I need to now since I've done away with the viscous drive fan and installed a 16" pusher (main) fan.
    I'm acutely aware that above 40 km/h it's totally unnecessary to have the condenser fans operating. This may hinder my new 16" main fan by 'blanketing' airflow to it if the 2 condenser fans are operating above that speed and a worry also at highway speeds.
    Attached Files
    Stag 2500S
    Jaguar STypeR Citroen C5


      I found this useful

      Its early here so apologies if my brain aint working yet!

      The fans pull a large current and the trinary is probably not rated for that, you may need a relay. I have seen cars use a “flapper switch” in the radiator shroud so that airflow stops the fans..

      Am I right in thinking you have this working already, it’s just the trinity and speed?

      Last edited by trunt; 12 June 2021, 16:07.
      Terry Hunt, Wilmington Delaware


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