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Exactly what Nubcake said. DRC is completely mechanical system, no electrical hookups for any of it. As he said, check the Reservoir first, check the codes, double check the parking brake lever is...

The Coolant line on the right side is definitely metal and not too flexible.

Mbagge01, he's talking about where that rear coolant pipe curves around the back of the engine and comes up the right side of the valve cover. I can't remember if you can pivot the valve cover up and...

FYI for those looking into it, I believe N.America only received the later style Radiators. At least looking through the parts catalogs and the 5 or 6 RS6's I've worked on have all had the later...

Yep
4B3 941 191 trim left
4B3 941 192 trim right
You may choke when you see the price though.

I don't think you can get at it from underneath, maybe with a 6spd conversion. What you might do is lower the whole subframe. I'd loosen the front bolts about 1/2" and then drop the rear bolts maybe...

No that I think about it all 4 of mine were Allen bolts.

Maybe a ball socket Allen so you can still get in there at a slight angle, I'm assuming the one you are having a problem with is the inner bolt.

It's a simple process. Both the High & Low ports are easy to get at. Good thing you're across the border, WA state Gestapo just made R-134a unavailable to DIY'ers. Only qualified HVAC techs can...

The bad news is it could be a lot of things. Helpful if you can trace wiring. For a start I have included the picture of the relays in the lower left side of the steering wheel and you can start with...

https://www.motormanfuelinjection.com/fuel_injector_components/bosch-fuel-injector-service-kit-ev6.html

Looking good

I would guess with the crappy Ethanol mixture gas we have it would cause our injectors to wear out early. A check of the spray pattern would be good but if there is pitting from the Ethanol I'm not...

This guy is in Idaho and has all of the seals you need for a great price.
https://www.mrinjectorparts.com/store/c1/Featured_Products.html

Also, since you did a manual conversion, Are you using a CPS from a 2.7t or are you using the OEM RS6 one with a bigger spacer? There is a spec for clearance but I know it will still work with a much...

Upper control Arms on the RS6 are no different than any other Audi, same exact arms as any facelift A6/S6 C5. You can get a complete Meyle HD or TRW upper control arm kit (4 arms) for under $200....

I'd have to hook it up to mine to see if there is a measuring block but I would assume there is. I would actually removed it and see if it was damaged during the install. The Flywheel should have...

This almost for sure. Especially since you had just pulled it apart. Did you pull and re-install the sensor or leave it in the whole time? Easy enough to pull and take a look at it.

www.bndautomotive.com

BAV says that part doesn't fit a C5 RS6.
https://www.buyaudivwparts.com/oem-parts/audi-sunroof-guide-jaw-4b0877165

The links I sent are just for the part numbers on the website. This is one of the sites that shows complete schematics for all Audis including N. America. I just use them for the part numbers and...

I love that GT4. My cars stretch from '74 911 to a '13 RS5 with a mostly Germany mix in between except for an old '84 F250 and ex-Military HMMWV, 24volt electrical system and all.

A/C controller is inside the headunit in the center console I believe. I wonder if you could pull it and re-check the connections on it.

I've been using Redline 5w-40 for 15yrs in my RS6. Not the Euro formula one but the Regular. It meets 505.01 and has the highest (HTHS) rating of any 5w-40 oil. I have started using BND 7.5w40 in my...

Assuming you are talking about a '03 RS6 then it would be a 4B. Check out parts for the C5 4B A6. Hopefully this link will work for part #'s....