Repair Review Car

1. Remove the front grill, which is held on with two screws at the top. Remove the outside temperature sensor by squeezing the prongs and pulling.
2. Unbolt the front support located behind the grill. There are four 10-mm bolts, three 8-mm bolts and two screws at the bottom. Remove the clips from the hood-release cable and push them to the front of the car.
3. Remove the secondary radiator. Its held on with two 10-mm bolts at the bottom. Remove the two hoses, and let the coolant drain into a pan.
4. Loosen the 13-mm bolt that holds the alternator to the block. Use a 13-mm wrench on the alternator bracket, turning clockwise to loosen the belt.
5. Remove the compressor belt for the A/C with a 14-mm wrench on the bottom and a 15-mm wrench on the top. Remove the power steering pump belt with a 15-mm wrench and a 13-mm wrench behind the pulley.
6. Remove the bracket shaped like an upside down L from the passenger side of the block with a 17-mm wrench.
7. Remove the plastic cover for the belts that is attached to the block and held on with 6-mm Allen bolts.
8. Remove the crank pulley. First remove the four 6-mm Allen bolts from the pulley and then the center bolt with a 27-mm socket. Put the car in fifth gear to keep the motor from turning.
9. Remove the metal cover located in front of the timing belt, held on with two 5-mm Allen bolts.
10. Put the crank bolt back in and with the car in neutral, turn the motor with a socket on the end of the crankshaft bolt until the small dot on the crankshaft pulley lines up with the arrow on the valve cover. Mark the dot and arrow with a marker or paint.
11. To make sure the motor is at top dead center (TDC), remove the first spark plug and use a long screwdriver to make sure the piston is at the top of its travel.
12. Remove the camshaft gear with the timing belt still on and car in fifth gear to keep the motor from turning. Remove the camshaft gear and timing belt. Put car back in neutral after it is loosened.
13. There is an inner metal plate that needs to be removed with a 10-mm and 13-mm socket. There are three bolts on the front, one on the passenger side and on for the water pump.
14. Remove the remaining 6-mm Allen bolt for the water pump and remove the pump.
15. Put a new seal for the water pump and reinstall the water pump (or install a new one); install in the reverse of removal.
16. Reinstall the camshaft gear, aligning it with the timing marks. Make sure the crankshaft is also still aligned with the arrow on the valve cover.
17. Once everything is aligned, install the new timing belt and rotate the water pump to set the timing belt tension. You should be able to just twist the belt to 90-degrees with your fingers.
18. Reinstall everything in the reverse of removal. Bleed and top up coolant system.

1. Pull the release handle under the dashboard on the drivers side of the Audi. Move to the front of the car and lift the hood. Turn the bolt on the negative battery cables clamp two full rotations with the 10mm wrench. Lift the cable from the battery and move it to the side. Return to the A4s cabin.
2. Insert the four stereo removal keys into the slots near the corners of the stereo deck. The keys are available through Audi or Volkswagen dealers, as well as through aftermarket car audio outlets.
3. Place two fingers from each hand inside the rings at the ends of the keys. Pull out on the tools to engage the release mechanisms on the sides of the stock radio while pulling the unit from the dashboard.
4. Pull the stereo wiring connectors by the plastic wire binders until they disconnect from the outlets on the back of the Audis head unit. Remove the antenna cable lead from the outlet on the factory radios rear panel.
5. Slide the installation cage into the A4s stereo mounting dock. Push the metal sleeve into the dashboard until the front edge is level with the face of the dashboard. Fold the metal tabs at the corners of the cage with the flat screwdriver to secure it into the dock.
6. Gather the stereo wiring and antenna cables from inside the stereo dock. Pull the cables to the front of the installation cage. Plug the stereo wiring leads into the wiring harness adapter. See the adapters manual for correct connection locations.
7. Connect the wiring harness adapter lead connectors to the outlets on the rear panel of the aftermarket stereo deck. The wiring harness leads can only connect to the stereo unit one way. Insert the antenna cable lead into the stereos antenna input.
8. Push the stereo unit into the installation cage until it locks into place within the Audis stereo dock. Return to the engine compartment.
9. Replace the negative battery cable clamp onto the A4s negative battery terminal. Tighten the bolt at the end of the clamp with the wrench and close the Audis hood.

1. Disconnect the cable running to the negative battery terminal. Loosen the nut on the cable clamp running to the negative battery terminal with a socket wrench and slide the clamp off the terminal.
2. Open the hood and look straight at the front of the engine. You will see a belt that snakes through a system of pulleys. This is the the serpentine belt, also called a drive belt. It needs to be removed in order to remove the alternator. Draw a diagram of the belt path and orientation. You will need this diagram when reinstalling the belt.
3. Remove tension on the drive belt with a socket wrench and a 14mm socket. The tensioner is on the drivers side of the engine, near the front of the engine. The tensioner bolt protrudes out of the engines pulley system at a 45 degree angle, with a little bit of a hex shape at the top of the bolt and a small hole in the middle of the bolt. Turn the bolt counterclockwise to remove tension on the belt.
4. Pull the belt off the pulley system.
5. Remove the electrical connector running to the alternator.
6. Remove the alternator. Remove the upper and lower alternator mounting bolts. The alternator is mounted on the front of the engine.
7. Install the new alternator. Installation is the reverse of removal. Make sure that you orient the drive belt properly when installing it.
8. Attempt to start the engine. As long as the battery was not drained entirely when the alternator failed, you should be able to start the engine. If the battery is dead, you may need to install a new battery. To do this, remove the cable clamps on the battery terminals following the procedure in Step 1. This time, youll be removing both the positive and negative cables. Always remove the negative cable first and attach it last. Once the cable clamps have been removed from the terminal, remove the battery from the battery holder and drop in a new battery. Then, reconnect the battery terminals and tighten the cable clamps.
9. Check to make sure that the battery light does not stay on once the Mercedes is running.

1. Open the hood and loosen the 10mm retaining nut on the Audis negative battery cable clamp using a socket wrench.
2. Slide the clamp off the battery terminal.
3. Wait 15 minutes. Then, reconnect the battery cable. This will reset the ECU (electronic control module) and the TCM (transmission control module).

1. Turn on your A3 to initiate pairing your device. Enable the Bluetooth connection by activating the Search Devices function on your phone.
2. Select the device beginning with Audi UHV and a string of numbers, then connect to it.
3. Enter a PIN number for the vehicle. If this is your first time connecting to the vehicle, enter the default code, 1234. You can change your code after setup, using your mobile device.
4. Pair the phone to the vehicle. Make sure your phones Bluetooth settings are set to Permanent On so that it connects to your A3 every time youre in the car. Refer to your phones manual for specific settings instructions.

1. Push Audi stereo removal keys into the slots on the side on the radio. The keys can be purchased from an Audi dealer or a car audio retailer. Push the keys in until they click into place. Using the keys, pull the radio out of the housing in the dashboard. Unplug the black radio antenna cable. Disconnect the radio wire harness by pushing the tab on the side and pulling the connections apart.
2. Install the face plate adapter. Audi S4s come with a double DIN-sized radio, and a basic aftermarket stereo is too small for the vacated space. A face plate adapter for the Audi can solve this problem and is available from car audio retailers. Click the face plate adapter into the slots vacated by the factory-issue stereo.
3. Attach the wiring. Connect the wire harness adapter to the wire harness of the car. Push the connections together until they click into place. Connect the other end of the wire harness adapter to the aftermarket stereo wire harness. Plug the black radio antenna cable into the radio antenna port on the rear of the aftermarket stereo.
4. Slide the aftermarket stereo into the port of the face plate adapter. Slide it is as far as it can go, taking care not to trap any of the wires. Turn on the unit to test the installation.