hello all!! im new to this forum.. or to forums in general.. I have recently acquired an audi a6-s6 series awd quattro 2.7l twin turbo dohc mfi maunal.. the car is having some issues.. hoping some people can give me some insight to what it may be.. so here it goes

first issue.. i start the car up no problem i start driving off into the sunset no problem.. after about 20 25 mins the car starts like bogging out and almost like shaking a bit when im under 3k rpms.. after 3k its perfectly fine nice and strong.. you can hear the turbos whistle and all through out all rpms.. also when im stopped and the car is idling the car has a small shake but car idles fine and where it should be...this also doesnt start happening untill the 20 25 mins has passed... only starts once the bogging out starts..

second issue.. all the windows will not work unless i open the drivers side door.. once i open the door the windows and sunroof and what not go up or down just fine... also the radio does not work.. not sure if the issues are related..

third issue...i went to my local auto store where they have a code scanner that you can use for free to read the codes.. the check engine light is on as well as the abs and air bag light is on. the brake light is flashing...when i plugged the scanner in to try and read the codes and go through the process when it says communicating with car after a min or so it comes up with an error something along the lines of cannot communicate with car would you like to try again or sometihng like that.. so i have not been able to pull any codes from it.. the guy that worked there also tried and he got the same error..

and last but not least.. when i had got back from driving the car to the auto parts store i parked it and got out to check the cv boots because the passenger side was clicking when i turned and i noticed that there was a puddle on the ground so i touched it with my hand and it was clear also has no smell no taste..( lol i dabbed a tiny spot on my tongue was told coolant has a bitter taste my mechanic use to do it lol) its directly in front of the passenger side front tire.. it looked as if it was running down the plastic wheel well cover and off the front bumper underneath like on the back side of it .. not sure exactly but the leak is def coming from somewhere in the area of the passenger side in front of the tire..

this is some recent work that has been done to it

R&R clutch, p.plate & t.o.bearing
R&R front disc pads
R/R valve cover gaskets
install alt (thats what it says on the paper work not sure what alt stands for)
install window control module
replace rf hei module headlamp

this is all i know of at the moment.. i dont know a ton about the car so trying to be specific as possible.. if theres any questions let me know and ill do the best i can to find the answer.. hopefully someone can give me some guidance!!! thanks !!
NOTE the first issue as well as the leak are whats really important to me.. the windows is minor the car driving properly is my rush!

 

Without being able to read the CEl or MIL codes, it will be tough to diagnose. I would find a good local foreign car mechanic and take it to him. Have it scanned, then clear all the codes and take it for a 20-25 minute drive and scan again after symptoms appear. That should produce a list of problems and needed repairs.


Alternately, I bought an Innova 3130 scanner about 3 years ago (I am sure there are better and cheaper now) and it can read and clear the Audi codes on my A6 and A4 3.0. The way you are headed it may be cheaper to have your own code scanner, but if the interface port is bad you have a bigger problem. Not all scanners will read VAG so maybe try another Autozone or similar. You need to ensure the interface port is good before any scanning can be done, and codes are the secret to keeping these cars running.


Turbos will produce some whistling noise as well as diverter valve noise, but if it sounds high pitched (like a dentist drill), it could be a sign of failing turbos. The door opening then window sounds like some kind of weird wiring short. I doubt the radio is related to the door -- is it locked or just not working? These radios will lock if the radio loses power (it thinks it is being stolen) and then you need the secret code to unlock it. Good luck finding that -- maybe in the back of your owner's manual.


Torn CV boots tend to leak grease, not fluid, in my experience. Fluid would be shocks. Or somebody previously parked there had their A/C on and it is water from that -- or pee.


Install alt = alternator.


The window control module could be related to your door opening then windows working issue.