Can you elaborate, please?
Just out of curiosity, how much did the complete job cost you? This sort of info is invaluable...
(sorry, this is a large post).
Total was £308 from first visit to A/C place, and about £80 for the second visit (was still getting a slight leak - noticed the bright leak dye after a few days of constant use, needed one seal sorting, new trinary switch fitting and regas due to 40% loss). ...and approx £28 for the current style of low-speed resistor.
Oh, and just under £25 for a Fram cabin/pollen filter from a motor factor.
In other words, more than i intended spending though glad I did!!
main bits from A/C place were:
New trinary pressure switch. Valeo p/n: 508655 (£31.50 inc VAT).
High-pressure custom hose: £68.86
Drier/Receiver p/n 31-1101 (unsure where from, google the p/n): £45.86
RS24 "R12 drop-in" gas: £23.75
Mineral Compressor oil (ouch...): £42.00
New shrader valve: £1.26
There was a few hours labour and a few small charges for o-rings, tracer/leak dye, nitrogen (used during standard pressure test) and vacuum test.
Valeo trinary switch has different connectors to original so needed to rewire existing plugs on (at the time original Alfa switch one was unavailable. Or was it twice the price??).
What gets me is the cost of the oil compared to the gas! I had an engine rebuild 2 years ago (this was a few months after the A/C packed up. As a result there was no oil in the compressor so it needed full measures). Thankfully after several months use the compressor seals look like they survived the 'dry period'.
IIRC the car originally took 1.25kg of R12 and 1kg of RS24 was put in.
For the low speed fan the notes below roughly describes what I did. This prob doesn't make a lot of sense unless you look at the car and compare it to a circuit diagram on paper.
I discovered a difference between the single-speed setup (UK Cloverleaf only?) and the diagram in the US 12V workshop manuals I had with a 2 speed fan - in the 2-speed setup the fan sits between the 40AMP firewall fuse and the high/low relays, in my single speed setup the relay sit between the 40AMP fuse and the fan (this makes total sense when comparing diagrams!).
Basically I used one additional relay (where a putting a current between pins 85/86 allows current to pass between 30 and 87, so the same type and rating as the existing fan relay).
For the low speed circuit:
Patched a wire from the red wire going into 87 on existing relay (this feeds from the 40AMP bar fuse behind the firewall) into the low-speed resistor (brown connector).
Patched a wire out of resistor (blue connector) into pin 87 of new low speed relay.
Patched a wire from pin 30 on new low speed relay into the black/white wire coming out of pin 30 on existing resistor (this is the wire that goes to the fan).
To trigger the new low speed relay
Patched a wire from the red wire that goes between radiator and block to pin 86 on the new low speed resistor. (this red wire is the +ve wire that goes into and engages the compressor, the logic being whenever the compressor is engaged the low speed relay engages the low speed fan circuit)
Patched a wire from pin 85 on the new low speed resistor to a ground.
When I have more time will make up a neat (readable) circuit diagram.