Question about 1999 Audi A4
Have u run a 12 volt jumper cable to the fan connector to see if it runs??
Posted on Oct 07, 2009
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Posted on Jan 02, 2017
SOURCE: temp guage not working
It's most likely one of two things: 1) coolant temp sensor (meaning the gauge isn't working), or 2) stuck thermostat (meaning the gauge is working but the coolant isn't getting hot)
Start with the coolant temp sensor - it's on the back of the engine, somewhat near the top, toward the passenger side. On your car it's likely a blue sensor body (as is the CTS on my 99 A4 2.8). The easiest way to get to it is to remove the tube leading from the airbox to the throttle body. Take that off, and you can look down and see that there's a squarish plug with four wires plugged into the top of the coolant temp sensor (at the right angle you can see the color of the sensor - black, blue, or light green, but most likely blue on your car). There's a C-shaped retaining clip that holds the connector onto the sensor which must be pulled off (pull more or less straight back toward the firewall), and then the sensor can be unplugged. The sensor itself is just pressed into the opening in the block, not screwed in - you just have to pull upward to get it out (it can be tough - try opening the cap on the coolant tank to alleviate pressure in the system). The sensor is not expensive (around $25 from www.ecstuning.com - call them up with your VIN number to guarantee they send you the right sensor).
If you change that out, and it doesn't fix the problem, don't sweat it - it means your temp sensor was working, but replacing it was a good idea anyhow since they're prone to failure and can cause all kinds of wacky problems when they go. Next most likely problem is a thermostat stuck partially or fully open, and this is more invasive - it requires removing the front bumper, opening up the core support (with radiator and AC condensor), losing (and having to flush and refill) your coolant, and the removal of the serpentine belt and fans. It sounds horrifying but it's pretty easy actually.
I'd suggest starting with the CTS and see if it fixes the problem. If it does not, reply here and let me know and I can help you through the thermostat replacement if you're mechanically inclined and have the tools. If you're in the northeast, I can do either repair for you (I'm in the southern tier of NY) and save you a bundle over a dealership, and save you the aggravation of doing it yourself if you're not mechanical or don't have the tools or experience.
Posted on May 02, 2009
Go to www.audidiy.com or www.audiworld.com (look in their Tech area), and there are full procedures on how to do it (it's the timing belt service). It's not a difficult job really, but you may need to get some specialty tools such as Torx bits to do the job.
Make sure that you get G12 coolant from VW/Audi (the pink kind) and if you have some other color in there now, flush it fully before adding the G12. You can order everything you need, including coolant, from www.ecstuning.com (I've used them many times with full satisfaction). Don't waste your money on the advertised cam locking tool - it's very expensive and wholly unnecessary. Its intent is to keep the cams from spinning, but if you position the #3 cylinder (rear passenger side) to top-dead-center on its compression stroke, the cams would have to be hit with a hammer to turn them.
The job is not difficult really. I've done many timing belts on many cars before, so I know what I'm doing overall, but the first time I did an Audi 2.8L V6, it took me a total of 5.5 hours start to finish. Many other cars (like my 300ZX) take that long just to reach the timing belt. As for how these kinds of jobs go, this is a very easy one.
Buzz me back on here or in email at firstname.lastname@example.org if you have any questions you'd like answered related to this or the rest of your car and I'll do what I can to help you out.
Posted on Jan 03, 2009
check if you can here the fan running. If not the cause can be that the bushes have reached there limit and need to be replaced. If you have the time and tools, you can remove the motor and get to the bushes. You will find that they have been worn down to a curn shape. If you remove each bush, and flip it 180 degrees, then the tip of the bush will make contact with the motor shaft. This will give you many months of fan life and save you a packet. You could also replace the buses with new ones - Audi do not sell them but can be matched by good auto shops.
Posted on May 08, 2009
the brushes in these motors are notorious for wearing. Simple fix though. Buy new brushes from me on ebay.
Posted on Apr 16, 2010
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