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wheeliebarz
12-08-2010, 07:56 PM
I posted on another forum and really didn't get an answer. First of all I'm new here but not new to cars, I am the owner of a Performance business which specializes in Ford/Chevy and diesel engine performance.

I recently acquired a 2000 1.8T (ATW) for a daily driver that suffered from timing belt failure, I received the car partially disassembled, I've purchased all I needed to purchase, rebuilt the cylinder head etc etc. I have it all back together however I am lacking two things. On the lower radiator hose there is a elbow/joint (whatever you'd like to call it) one hose goes to the radiator, the other goes to the coolant tank, I cannot for the life of me figure out where the other hose comes from that inserts in the outlet facing the passenger side of the vehicle or if it's even a hose. Can anyone shed some light on me? All of my manuals do not go into any details about this neither does ALLDATA. Any help would be appreciated.

http://i215.photobucket.com/albums/cc274/psd345/audi.jpg


Next question, where does this go?
http://i215.photobucket.com/albums/cc274/psd345/2010-12-07140906.jpg


Thanks in advance.

walky_talky20
12-08-2010, 08:21 PM
That blue thing goes in the hose. That is the thermal fan switch. It was most likely removed because that is the easiest way to drain the coolant. Just pop out the switch and catch in a bucket. The factory rad drain plug is a joke.

You will need an o-ring and a plastic clip to hold it in there. That is what the "slits" in the side of the opening are for: the horseshoe clip.

EDIT: Here I've got some pics:

NOTE: Sensor should be blue, like you have, not green as shown in the photo. Just so we're clear. This will show the placement of the switch, though.

http://farm4.static.flickr.com/3069/2845551807_fc937a1d63_d.jpg

http://farm4.static.flickr.com/3165/2845553739_b01b715ff8_d.jpg

Also, here are the parts (clip and o-ring) you might need, if you don't have them:
http://www.ecstuning.com/Audi-B5_A4-Quattro-1.8T/Engine/Cooling/Temperature_Sensor/ES1906430/
http://www.ecstuning.com/Audi-B5_A4-Quattro-1.8T/Search/Coolant_O-Ring/ES2467/

I, myself, am also a victim of the lack of documentation of this specific fan switch. When I first got my Audi, the pictured green Engine Coolant Temp sensor was placed in the hole for the cooling fan switch. It took me a little while to figure out why my fans were running all the time. Turns out the resistance of the ECTS is just enough to close the cooling fan relay. Also turns out that Audi used the same exact connector for both. Which allowed some previous mechanic to swap it out for me. Thanks guy, just...thanks. Here's my thread on it if there's any interest:
http://www.audizine.com/forum/showthread.php/234149-Aux-Fan-Running-Thermal-Switch-Question

wheeliebarz
12-08-2010, 08:38 PM
Holy crap, thanks a million. I believe I have a clip like that inside the car. I got the measurements of the required o-ring from that site and will see if I have one at my shop. Thanks a lot. Perhaps I could fire this thing off in the morning. Thanks for the links as well.

walky_talky20
12-08-2010, 08:44 PM
You might want to check in the hose to see if the o-ring is still there. It is quite common for the o-ring to stick in there. It is always advisable to replace it, of course. But as long as it doesn't leak when you're done, no worries.

wheeliebarz
12-10-2010, 08:31 PM
I bought a new o-ring, poured the $26 gallon of G-12 and distilled water, went to bed last night, came out this morning to see a $28 puddle under the car. Heater hose is busted. I will have to replace, I have no Audi dealership within 100 miles so I'll just make a heater hose. VW dealership is out of the question, they're unwilling to sell/try to look up anything for an Audi.

So a heater hose and trying to located where the vacuum line that plugs into the top of the diverter valve goes and this car should be rolling.

walky_talky20
12-10-2010, 10:35 PM
VW should be able to get you just about any engine part. Everything is the same as a Passat. Which hose are we talking about?

EDIT:

Heater return hose (heater core to water pipe): ~$55: 8D0819373N
Heater feed hose (coolant flange to heater core): ~$85: 8D0819371H

I just checked, they are definitely the same hoses as on the Passat. Kind of expensive, though. So if you can repair it, that might be best.

frameshift18
12-11-2010, 01:53 AM
So a heater hose and trying to located where the vacuum line that plugs into the top of the diverter valve goes and this car should be rolling.

The vacuum line from the DV goes to the nipple on the intake manifold closest to the front of the car. Near the upper radiator hose.

walky_talky20
12-11-2010, 03:27 PM
The vacuum line from the DV goes to the nipple on the intake manifold closest to the front of the car. Near the upper radiator hose.

Actually, on a 2000 it is different. The DV line will go directly to the N249 valve that lives under the intake manifold. Here's a pic, N249 is on the left, N112 (for secondary air) is on the right. Installed on the car, the N249 will be closer to the radiator, the N112 will be closer to the firewall:

http://farm5.static.flickr.com/4149/4969298468_5b652cc222.jpg

The N249 has a vacuum line that will go to the front manifold port, shown above as "to intake manifold".