You will need a scan there but is suspect unfortunatley that is a sign that it needs a new ABS pump and ECU combined (common) sometimes if the coolant header tank has been leaking it drips down onto the ecu plug and does the ecu. I ve just looked a t a Passat same set up and i am in the process of locating a recycled unit. A/C could be a number of things, could even be simply the ign switch ( common) losing feed to the A/C ecu, again a scan and look at the values at the ECU will tell you. Mate make sure you check out that service history, Cam belt and tensioner a must mate if you are not sure , not only that its piece of mind.
My money would be on the ABS unit for sure and A/C - i wouldnt make a call on that till you have a look further and give a wee bit more info.
Good luck - Quattros are tops mate good strong diff no worries there.
Cheers
Alba European
Service, Diagnostics and repairs. Mobile Diag available on request
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