Turn signal only works now and then Audi a4 avant wagon

You make it sound like it's our fault you can't find it :>D

The start of production of the Audi A4 B5 is 1994. With minor changes, it was produced until 2001. At first, only the sedan version was available, the station wagon (Avant) appeared a year later. This material provides information on relay circuits and fuses Audi A4 b5 1994, 1995, 1996, 1997, 1998, 1999, 2000, with an assignment of their elements and locations.

Can't get much clearer than this. Relay 4 is one plus 'Additional Relays 23 and 24. Plus fuse 23 and 24.

Fuse box diagram Audi A4 B5 and relay with assignment ...

https://fuseandrelay.com > audi > a4-b5

This material provides information on relay circuits and fuses Audi A4 b5 1994, 1995, 1996, 1997, 1998, 1999, 2000, with an assignment of their elements and ...
‎Passenger compartment · ‎Main fuse box · ‎Relay box · ‎Engine compartment

1999 Audi A4 Quattro Avant

The Low pressure A/C refrigerant port

The High pressure A/C refrigerant port

Top up with oil.

each door has a control unit that controls the electrics for that door. the signal, power supply or earth wires tend to break in the rubber boot between the body and door. a diagnostic check should give you an idea where the problem is.

You need to use a code which came with the care when new. If you don't have it your dealer will be able to get if for you (for a price).

'Fraid I can only vouch for the A6, but the A4 is very similar and has many common components. On the A6 it's reasonably easy, as the access is from behind the glovebox on the inside and under a filter next to the battery on the outside. Audi's are notorious for having burnt-out/seized heating blower fans, so your diagnose is probably correct... :(

audi a4 tdi Emission control system light on dash

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

Yes it is a known failure of the combination switch (the switch assembly on the left side of the column, comprising the turn signal/cruise control stalk and the headlight stalk). They're a problematic part of the B5 chassis (model year 96-01) A4 cars. The fix is to replace the switch assembly, which involves removing the airbag and steering wheel. It's not a difficult job but I recommend having it done by an experienced technician if you haven't worked with airbags before. For the part, you can find them on eBay or at Audi salvage yards like www.shokan.com (who will ship it to you), or you can spend about $150 or so for a brand-new one from www.ecstuning.com, www.germanautoparts.com. Honestly, I'd just buy a new one - if you get a used one, it may last years, or it may last days, and there's no way to know beforehand.

If you're in the northern PA, southern NY area, I can do the work for you with no trouble. Otherwise, find an independent Euro specialty shop in your area - they'll have the experience with the Audi but won't charge as much as a dealership.