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Re: How do I remove/replace the air filter in a 2001 Audi...
There is a large round flexiable hose that goes to the engine, at the other end of that hose is the rectangular shaped air filter box, it will be made out of plastic, under the top cover of this box is the air filter element.
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I am going to say 'blown turbo'. As I understand it, they needs replacing every few years. They are susceptible to heat and incredible revolutions. They have to be lubricated, the seals go, and you get smoke.
For 2007 Audi A6 depending on the engine type, there are two placements for cabin air filters: 1. The cabin air filters are placed on the right bottom side of the central console - passenger side, for 2007 Audi A6 Avant. Remove the carpet and behind the plastic cover are cabin filters. When installing new filters see for the correct position - air flow is indicated by an arrow. See pictures below:
2. For the second placement, besides you need to remove the glove box for access and replace cabin air filters. Check first your car situation. If you will give me your e-mail address, I will send you photos with cabin filters replacement for 2007 Audi A6, because the www.fixya.com website is limited to 150 kb traffic.
Audi S4 V8 engine 4,2 liters alternator:
1. You need radio code
2. Disconnect car battery
3. Release tensioning roller
4. Remove ribbed v-belt
5. Detach electrical connexions from the alternator
6. Remove fastening alternator screws
7. Pull out the alternator
8. Install new alternator on the bracket
9. Refit all in reverse order
10. After battery connection you must set up radio code
11. Check up electrical supply from the alternator with a multimeter in parallel connected on battery: around 14 Volts tension voltage value, engine at idle runing.
Thermostat has failed (stuck open) and needs replacement. It's a big job (5-6 hours charged labor for a shop), and requires the front of the car to be removed. Here's a pic of my car (B5 A4) a few weeks ago when I changed mine:
After a certain model year, the module above the glovebox disappeared and the controls it contained were built into the car's computer. If your cruise in your S4 is failing, it's most likely the combination switch (the stalk on the column) - it fails on virtually every B5-chassis Audi at some point (I'm about to install my third one on my 99 A4). Get that part, install it, and you should be good to go.