Aug 15, 2016, 11:51 AM
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Main Radiator Fan Relay
Thread Starter
AudiWorld Member
Joined: Mar 2002
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Main Radiator Fan Relay
I am stumped.
While doing the timing belt, I discovered that at some point prior to my ownership, the main electric radiator fan had been unplugged at its connector near the power steering reservoir. Curious as to why this was un plugged, I plugged it back it. The fan immediately roared to life, and after waiting 2-3 minutes with a cold engine for it to shut off, I unplugged it again.
In my searches of the forums, it seems that the few people that have had a similar issue, have reported that the '219' relay in the weatherproof ECU box is the culprit. I have opened the ECU box, and there is nothing aside from the ECU in there.
Car is a 2000 A6 2.7T 6 speed.
Anyone have any idea where the mystery relay might live in this car?
Thanks!
While doing the timing belt, I discovered that at some point prior to my ownership, the main electric radiator fan had been unplugged at its connector near the power steering reservoir. Curious as to why this was un plugged, I plugged it back it. The fan immediately roared to life, and after waiting 2-3 minutes with a cold engine for it to shut off, I unplugged it again.
In my searches of the forums, it seems that the few people that have had a similar issue, have reported that the '219' relay in the weatherproof ECU box is the culprit. I have opened the ECU box, and there is nothing aside from the ECU in there.
Car is a 2000 A6 2.7T 6 speed.
Anyone have any idea where the mystery relay might live in this car?
Thanks!
AudiWorld Member
Joined: Nov 2004
Posts: 104
Likes: 0
I think you may want the fuse/relay box under the hood, beneath the plastic panel at the base of the windshield, driver's side. As far as I know, that's where most of the relays live on the A-6 (maybe A-4s and A-8s, too). Good luck.
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Joined: Dec 2007
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AudiWorld Senior Member
Joined: Mar 2004
Posts: 911
Likes: 17
I have a hunch that the problem is with the fan control module, which is bolted to a driver side vertical frame member near the side of the radiator. Could be that the fan was unplugged to stop the jet engine fan roar that happens when the module fails and goes to the default highest speed setting. You can see the module from under the car, but it is difficult to replace due to limited access to the 2 10mm bolts. You might be able to get it out with a ratcheting box end wrench. But starting the bolts to mount the new module will be a beeaaccch unless you pull the bumper cover and assume the service lock position. Then it's a piece of cake.
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I am stumped.
While doing the timing belt, I discovered that at some point prior to my ownership, the main electric radiator fan had been unplugged at its connector near the power steering reservoir. Curious as to why this was un plugged, I plugged it back it. The fan immediately roared to life, and after waiting 2-3 minutes with a cold engine for it to shut off, I unplugged it again.
In my searches of the forums, it seems that the few people that have had a similar issue, have reported that the '219' relay in the weatherproof ECU box is the culprit. I have opened the ECU box, and there is nothing aside from the ECU in there.
Car is a 2000 A6 2.7T 6 speed.
Anyone have any idea where the mystery relay might live in this car?
Thanks!
While doing the timing belt, I discovered that at some point prior to my ownership, the main electric radiator fan had been unplugged at its connector near the power steering reservoir. Curious as to why this was un plugged, I plugged it back it. The fan immediately roared to life, and after waiting 2-3 minutes with a cold engine for it to shut off, I unplugged it again.
In my searches of the forums, it seems that the few people that have had a similar issue, have reported that the '219' relay in the weatherproof ECU box is the culprit. I have opened the ECU box, and there is nothing aside from the ECU in there.
Car is a 2000 A6 2.7T 6 speed.
Anyone have any idea where the mystery relay might live in this car?
Thanks!
Tech Guru
Joined: Oct 2002
Posts: 8,009
Likes: 191
From: Olney, MD
here is ebahn pic of relay panel.
Open the big plastic box under the plenum cover. It's right in front of the driver side. Four or five bolts into the plastic box, the back two can be a beatch to get out, don't break the box cover! With the engine off and the coolant fans running, pull one relay at a time until you find the right one. It should be #2 or #3 so start with those.