I have an Audi A4 Avant. Where is the fuel flap control lever?

You can raise the brightness with the dash light dimmer control have you tired that?

InInside the drivers door in the back of the storage compartment is the switch to open the fuel door.

1999 Audi A4 Quattro Avant

The Low pressure A/C refrigerant port

The High pressure A/C refrigerant port

You can access this threw the trunk. Pull back the trunk liner. look at it and you will see what to push/pull to open

Not necessary to replace any components, but the engine Exhaust Gas Recirculation (EGR) system needs to be cleaned inside together with the intake manifold, (both EGR throttled valve and intake manifold).

Here is a manual, but you have to purchase it:

http://shopping.msn.com/prices/audi-a4-service-manual-1-8l-turbo-2-8l-including-avant-and-quattro/itemid2373553/?itemtext=itemname:audi-a4-service-manual-1-8l-turbo-2-8l-including-avant-and-quattro

ONE OF THE HEATER DISTRIBUTION FLAP MOTORS FAULTY.UNSCREW GLOVEBOX AND YOU WILL SEE THE ONE THANS NOT WORKING(TURN ON BLOWERS TO TEST)

If you are looking for it's location,It is inside the fuel tank.

what is the problem with it ?-engine or a/c or what,they look like heater flap codes to me