A bit of wiring today. Ive decided to simplify the A/C electrics and use the aftermarket switchgear. I dont see any reason at all to let the Td5 ECU have any say so over the A/C. Why complicate things. If the A/C stops working I'm going to know about it, I dont need a computer to tell me. As far as the ECU thinks the A/C will just be off or unplugged.
Removing the loom across the front of the engine & unwind the tape to expose 4 wires, two thin brown wires go the the Coolant temp sensor. The Black wire (no1) is Compressor Clutch -ve, The Green wire (no2) is Compressor clutch +ve .
Splice extension wires onto clutch wires & extend loom. Green wire will go a new Compressor relay which will be stuck next to my headlight relays. I also traced my Condensor fan wires to the old disconnected EGR loom under the Power Steering bottle. I cut the wires out of the loom and bought them up to relay area. I'm going to wire the condensor fan to come on with the Compressor and will also take any ECU control away from it, I'll add an extra Switch on the dashboard where I can manually switch the fan on if req.
I've bought all wires out in the fusepanel area, Oh its soooo easy to get to the fuses now without that 'orrible A/C in the way
Arrow number one points to the green 30A fuse which provides +12v Batt to the Thick brown wire on the old A/C plug (Arrow no 2) the White - Green stripe wire on the plug is +12v IGN from the yellow 20A fuse (next to the 30A fuse) . Blue - Black stripe is -ve 12v.
I'll use these wires to power the new A/C fan via a relay.
Arrow 3 points to a 5-core trailer cable which runs thru the dash up the passenger side windscreen pillar, then to the new rear A/C unit along the indside gutter under headlining.
One thing about this A/C unit, it has twin motors, each motor has 2 fans, one fan for each vent. It Blows... Heaps sitting in the front the air movement is plenty strong enough - I do not think I'll bother with an overhead console.
Problem with twin motors is it drones, as a result of the motors not doing EXACTLY the same RPM, you get a resonance. Its the sound I used to love when I was building twin engined R/C aircraft , there was nothing like the sound of a twin with prop tips just cracking the sound barrier & just out of sync. ... something I think I'm going to dislike now.
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