RE: Looking at a A6 4.2L few questions
These cars have 2 temp gauges. One for the water and the other for the oil. On my 2.8 V6, it takes awhile for the water temp to rise, and it even takes longer for the oil temp to rise or even move above 150. 10 mins of idling may not move the oil temp at all. Take it for a spin and you should see the water temp rise, then the oil temp following after the water temp gauge. If it does not rise at all after driving for 15 to 20 minutes, I suspect that the gauge is busted.
As for the radio display, do you see any dead pixels or messed up pixel layout? These cars are notorious for that. Sometimes, if you pull the radio fuse and insert it again, it fixes itself, but not always. Only other way is to replace the whole deck.
As for the regulator, do a web search. It is just parts cost plus labor.
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2001 A6 Avant
2.8 ATQ, Quattro, Tiptronic
Mods - None
Repairs - Too many to list! And you wonder why I still drive an Audi
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