Breezy_Pete

Can you message me with your VIN, or just post it here?

Could be an interesting experiment, if the A/C works.

Maybe get it on VCDS, to look at what coolant temperatures actually are when the engine is fully warmed up? Might be running hotter than it ought to be, without triggering any warnings.

The sensor is in the aluminium pipework, near the coolant expansion tank. Probably a fuel filter in the way of easy access on a vRS. Have a look at the wiring where it comes out of the connector, and if you can disconnect it, look for wetness or corrosion on the contacts. Insufficient refrigerant can/does give one G65 fault code, but the fault description would say 'low refrigerant pressure'.

What was the exact fault code, please?

I would expect so, yes. Don't know much about airbag issues though.

The Halfords employee has motivation to sell you the most expensive option. Without seeing AGM written on it with your own eyes I would be quite sceptical.

As per reply to PM, all Scalas seem to have EFB factory-fitted, at least for similar build date.

If you message me the VIN I can see if that gives any definition of the factory fit battery type. I have a feeling it may not, but I could be wrong.

OK, ta. According to circuit info, fuse 22 (40 Amp rated) is permanently/directly powered from battery positive, and there is no other device between the fuse output wire (black/red 4mm²) and the 6-way beige connector you have in the last photo, except a 10-way intermediate connector where that black/red from the fuse changes to the red/white that goes into the beige connector. Location of this intermediate connector described as 'behind dash panel', rather unhelpfully. Finding this connector and checking for corrosion of contacts may be what you need to do.

Your fronts are PR 1ZA, 312 x 25 Rears PR 1KS 272 x 10

Pressure gauge sounds like a good plan. Look to see if pressure is close to the switch rating, especially at just above 1500rpm, with engine at full temperature.

Probably 2011.

Just one pressure switch. Where did you buy the replacement from? I thought the rpm threshold was 1500, and I don't think the cluster (pack?) ever monitors the switch state below that, except perhaps during cranking.

What year is the car please?

@Turbointercoolosis there may be a typo in that VIN, it isn't recognised. The XX bit looks unusual, I think?

Very few people have ever looked under that flap, so hardly anyone knows about the drain being there.

Yes. Looks like the flap of sound insulation that originally covered it to prevent dirt/critter ingress has been torn right off.

Any chance you had rain/puddle water dripping off shoe soles onto mats on that occasion? Blasting air at the floor would have started to evaporate that fast. No airflow on cold glass would have given that somewhere good to condense again straight away.

Wow, who'd've thought they would find another way to make the CR1.6 engine go wrong?

Good call, and vastly more likely I reckon.

Perhaps the front car emergency stopped without driver action for no real reason; and maybe the driver of the blue one was texting. Who knows.

Yep. That fuse and several others are fed by that 100 relay, so could be that playing up.

Check engine bay fusebox, fuse 15, 5 Amp rated.

Yes, there's a resistance to control the speed of operation. Might be a conventional wirewound resistor with multiple tappings for different speeds, or a transistorised version, depending on A/C controller type.