Tuscan Aircon not working

[leeroy343]

Hi I have retrofit AC to a 2001 Tuscan (mk1).

The system has been leak checked and gassed up (750 grams gas).

Trinary switch shows continuity across the medium circuit (Red/white and Black/white wires) and open across the high/low circuit

Trinary switch is wired up as follows

Trinary sensor loom Car loom
High/Low circuit
Black/Green Black
Black/Green Green/Pink (Fan control via Relay 51)
Medium circuit
Blue White/Pink
Blue White/Black

The fan works if I earth the Green/pink wire above

AC compressor clutch can be closed with 12v direct to the compressor clutch wiring

AC compressor clutch wiring has continuity to the heater ECU plug.

Is there anything else I should check before sending off the heater ECU and heater panel to a specialist to check the electronics?

[MartinBrown2409]

Hi, did you get any answers with this, I have posted similar question but without the level of understanding you have. Was hoping mine was as simple as a relay or fuse tbh !