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I spent a lot of time on this years ago. https://forums.tdiclub.com/index.php?media/brm-vacuum-lines-and-components-in-color.121372/ You're welcome....

The codes are clearly pointing to where you should look.

I have found this particular document to be very helpful. VWUSA.COM_SSP_873403_MK5_Jetta_Electrical_System.pdf I searched the WWW just now for it and found what appears to be a great place to locate VW information titled VAG Self-Study Programs (SSP) - Courtesy of Volkswagen Group of America...

What codes does your Ross-Tech device report?

I had a thermostat go bad by failing partially open, and your problem appears to be the same. Fortunately, replacing the thermostat is cheap and easy (for a VW).

I'll take another look tomorrow.

Very odd behavior today with my Jetta, in that shortly after starting the car, I rolled all the windows down a bit to let some of the hot air exchange with outside air for a mile or two before turning on the A/C. The driver side window was down only an inch, but it would not go back up. I...

I have a new harness that I bought a few years ago somewhere in my garage, but I can't locate it right now. I bought it thinking it would solve my issues at the time but found the issues to be something else, so I never used it. Right now I still don't need it. I'll keep looking for it as I...

Engine Wiring harness?

I seem to recall just using ATV instead of a gasket on my 2006 BRM...

Yeah, that was my post... It is almost certainly the booster. If you do the job yourself, which is doable, the most difficult parts are releasing the plastic retaining clip in the brake pedal from the booster and finagling the booster out of the engine compartment. I made a clip release tool...

You have replied to a post that is over 8 years old

The vacuum pump runs where performance is directly proportional to RPM. The performance you are describing could possibly be related to the vacuum available to control the boost. Check all your vacuum system related hoses and devices. On my 2006 Jetta TDI BRM, a leak in the vacuum reservoir...

Learning how to read the Bentley wiring diagrams is in itself quite the project. There exist excellent Youtube videos about how to read these. It is a non-trivial exercise to say the least.

I bought my 06 with 50,000 miles on it and have had to replace everything that ever has been reported as a problem except injectors and the engine wiring harness or fuel pump. I too would have been far better economically off getting a Camry, Civic or even a Mazda 3, but I must say that this...

What does your VCDS say?

Understanding the Bentley wiring diagrams is a non-trivial exercise, but worth the time if you plan on keeping a VW. How to read Wiring Diagrams, part 1 of 2 I would not even consider for a moment owning a VW unless I had a VCDS to tell me what it is doing.

I had a couple vacuum leak issues over the years. An unexpected one was the integrated vacuum reservoir in the cylinder head cover. It is easy to check to see if it holds vacuum. If not, it can be fixed with silicone around the seam which creates it right on the top of the cover. That leak only...

These cars are not designed to run with only water in the cooling system.