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Hmmm. This is not something that one wants to get wrong. This is an 'interference' engine, and valve timing gone bad will wreck valves/head.
There are timing marks on the crankshaft sheave and on the camshaft drive. (Basically, this is done with the engine at top dead center. I don't think the pictures are that good on this site - i'm not sure you could see if I copied and pasted - but crash around the internet and, depending how computer-ish you are, you will find A4 manuals that show these marks. (The official Audi 'manual' is called ETKA and is killer huge. There are some copies of Bentley manual sections kicking around. There is a copy or two of the Haynes manual...) While you are getting the manual parts that show the marks, you will also get a diagram that shows the crankshaft rotation.
Once you have the marks (and make sure and then make sure again, and then make sure a third time that you do) the 'tight' side of the belt is the one on which the crankshaft rotation 'pulls' the camshaft, and the 'tensioner' side of the belt is the one on which the rest of the belt heads back up to the camshaft. So you have the timing right when the marks are where they are supposed to be when the tight side of the belt is tight. When you have it right, but only after you have it right, and you are sure, then pull the pin that releases the tensioner - and puts tension on that side of the timing belt. (It is possible to recover the tensioner and re-set the belt if you have pulled the pin too soon, but it is not fun).
in order to remove the radiator you will have to take off the front facia, there are many screws and fasteners holding this on, once you get that off you can see everything and you can disconnect the hoses and other fasteners, its kind of a big job but if you have patience and a little know how its not so bad
align timing marks on furthermost bearing caps on exhaust and inlet side to respective camshaft sprockets. to confirm correct fitment, their should be 16 chain links starting from one timing mark to the other.
Maybe relay switch faulty.The main relays are located behind a panel on the drivers side of the facia others in back of engine bay....Or could be switch module which is on your steering column..But at all costs keep back from audi dealerships will rip you off...
facia one fuse 25
facia two relay 16
facia three fuse 5, relay 2, relay 3
all three of the above panels are located on the drivers side (which in the diagram i have is righthand drive).
Those are pretty much all the fuses and relays that control your a/c. the clicking noise you hear is probably one of the three relays i've listed. now i don't know alot about audi's except i'll never own one. but i have a lot of information if you have other questions.
that flickering you noticed could be one of the relays failing or you have a short somewhere in the wiring.
anything else you need feel free to ask
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Incidentally the only reason that i can think of that those parts would melt is that the current is high on those wires. are there any recalls that you are aware of ?