At my wits end with issue!!!

[Riksta]

I've posted this issue up before and not really got much help, thought I would try again anyway see if anyone has ANY idea whatsoever what could be causing this.

Its been back under warranty a couple of times, seemed to have come good, then again - previously it did it in hot weather, today's the first decent hot day we've seen in months and whammo, issue pops straight back up again.

Basically - these are the symptoms exactly as I've noted them - when it comes good again all but one of the symptoms disappear.
- Hot day
- Start car
- Odo screen displays "Power Steering Failure"
- Power steering does not work (very heavy non power assisted)
- ABS Light stays on
- Park brake light stays on (even when park brake is off)
- Engine light stays on
- Speedo does not register any speed (sits on zero)
- Windscreen jets will not squirt (front wipers will work)
- Rear wiper will not do a full sweep and return. Works about a third of this, then stops - only way to get it going is to stop/start the rear wiper - at which point it will only do another third and so on.

Now - when it comes good - it comes good, but the engine light stays on for quite a while afterwards.

This list is all I have noticed, there may be other things behind the scenes I haven't noticed yet - but everything else like power windows & the wireless all seem fine.

I've called the RAA in the past on it, they're at a loss to explain it, the dealer (Holden dealer I bought it from) can't figure it out and send it off to Ford dealers - who replaced the power steering pump because all they would listen to (despite me telling them all the above) was the fact power steering was failing.

It normally comes good after 15-20 minutes of running the car, but when I'm trying to get home from work I don't want to sit and wait for it to come good (I drove it home tonight and it came good after about 15 minutes into the journey).

Apparently "there's nothing wrong with my car" as no dealer can seem to replicate this fault, but in all seriousness I'm about to hand the car back and basically say I don't care if it has to go back to South Africa to get fixed, JUST FIX IT.

Does anybody have any ideas or insight as to what it might be so I can tell them a possible cause when I get to take it in (won't be for just over a week unfortunately) - although even if I do give them a possible cause they'll probably ignore me because they know best.

Any help appreciated.