I'm really starting to enjoy my new-to-me 2004 Audi A4 Avant. Like whatsoever Euro, it's got few quirks merely overall it's been an honest, amusive to push sports wagon. However, the other day my Audi had its number 1 substantial "problem." While at a weekend piece of cak, my car was unmoving in the driveway relatively more or less where I was sitting. With medicine and conversation, it was petrous to hear anything another than the close sound of the picnic. All at once, a friend overturned to Pine Tree State and asked me if I had left my car on. I told him "no, why"? He and so told me that it sounded comparable IT was on and subsequently listening very attentively for a second, I could hear what sounded like an idling engine coming from the driveway. As I got nearer to my railroad car, I could hear the auxiliary fan spinning at full moon speeding! Amateur Diagnosis The elevator car had been sitting for over an hour and the keys were in my scoop. Surely something wasn't right as my car sounded like an aeroplane happening take off. I turned the lighting to the second position and immediately the fan shut bump off. I pulled the key out and walked away a little muddleheaded, nerve-racking to convert myself that perhaps what happened was normal when it was hot. Embarrassed, I told my booster the car had any cool feature that I accidentally upside-down on where the fan runs every nowadays and again to pre-cool the cabin informed damn well there was no much thing happening my car. I as wel loved to hear if it would happen again so I listened very closely for IT. Sure decent, about 45 min later the fan came back on and required the ignition to be switched happening to turn it sour. After doing some research, it seemed as though this was a problem that had affected a decent number of B6 owners. The root of the problem involves clogged drains and/operating theatre a cracked ECU box. Few weeks back, I had to ride the railroad car home in a torrential downpour, thus if water was leaving to get anywhere information technology shouldn't have, that was the time! Corroded Relay Au fond, what commode happen is weewe can move in your ECU box and causal agent a small pool to form in the nether which, in some cases, can inundate relay 219 (which operates the fan). If this happens, the internals and contacts of the relay can become unsound and cause the fan to number erratically. If this has happened to you, you will need to replace this electrical relay and either clear your drains so that piss will no more pool Beaver State replace your cracked, disordered ECU lid. What You'll Require Accessing the relay is fair straightforward. Begin by removing the weather strip and so the plastic hide that goes ended the battery, ECU box and cabin air filter trapping. Your ECU box is located on the right side of the engine bay. Get rid of the threesome T30 Torx screws in the figurehead of the box. My ECU lid was nonexistent the left right-handed screw and it seems as though a lazy mechanic had just incomplete it off at the back right one owing to the need to draw the wipers dispatch to approach that screw. Therefore, after removing these three screws I could pull mine out. The straightlaced way to memory access these final two screws is to remove the right wiper, allowing you to move the plastic shield enough to memory access this rear screw. Replace the ECU cover if information technology is compromised in any way. On some models, like mine, there is a metal clip which bridges across the ECU itself. Advertize down connected either final stage of it to eject the clip. You can then wind the ECU taboo of the direction which will reveal the 219 fan control relay. Note the evidence of water in the ECU box from the determined orange "rust dust". It seems as though the other ii relay race have been unaffected aside the presence of water in the box seat...or at to the lowest degree to my knowledge. It may take some patience trying to wiggle the relay out (the corrosion doesn't help). Once you off the old one, ensure that the internal contexts aren't compromised. Pop the new electrical relay in and re-install the ECU and hatch (properly!). Also, use this experience As a friendly admonisher to check all of your drains to ensure they are clean and functioning properly. Now you can relax deliberate your fans are no more haunted! Have you experienced unusual behavior from your car? Let US roll in the hay in the comments. 
2008 Audi A4 2.0t Radiator Fans Not Coming on ?
Source: https://blog.fcpeuro.com/how-to-stop-a-cooling-fan-that-randomly-turns-on-off-audi-a4
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