majinruu

Coolant Temperature Light had come on about 2 weeks ago. First thing I did was check the coolant level, everything was good it was just right above the minimum level. Second thing I checked was to see if the coolant tank had any crack or leaks and nope it was perfect. I drove the car back from a trip I was in and during the trip I kept my eye on the temperature gauge. It stayed right in the middle the entire way so, I knew the car was receiving coolant.I figured at this point the coolant temperature sensor was out so I got it replaced. I knew to reset the computer you take the battery connection out so, I took the negative side off the battery and left it for about 15mins. I then put the battery back on and the coolant light still came back on. I don't know what could be wrong a this point in need of help.

Giovanni Giovino 6.0+6.0TT

Hello Majinruu,
Do you have a scan ?
http://www.ross-tech.com/vag-com/cars/applications/a4s4.html

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majinruu

Unfortunately I do not, I took it in to autozone and they said they couldn't see anything wrong.

Giovanni Giovino 6.0+6.0TT

Unfortunately AZ scan will not help, you need to have A Ross-Tech setup to properly diagnose any VAG vehicle.

https://store.ross-tech.com/shop/cat/VCDS


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majinruu

I see, any ideas on what you think the problem might be? Usually most places charge quite a bit for a diagnostic.

Giovanni Giovino 6.0+6.0TT

Sorry, but I have not been under the hood of a 3.0 in some years, I mostly work on A8 4.2, W12, and my B, but you may check to see if in fact the 3.0 has more then one sensor, click the attachment and link.

https://parts.audiusa.com/a/Audi_200...G/1397080.html

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Giovanni Giovino 6.0+6.0TT

For $199.00 you could own your scan tool, almost pays for itself the first time instead of going to the dealer for a scan, you will need a laptop.

The $199 will get you the 3 # VIN option.

https://store.ross-tech.com/shop/vchv2_ent/



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majinruu

Update: I ended up checking out the coolant level sensor, it appears that the sensor is built into the coolant box. I unhooked it to check it out and hooked it back on and the coolant light ended up going away. I guess it wasn't attached properly before or I got lucky but thanks for the info!

Giovanni Giovino 6.0+6.0TT

Glad it worked out, if it happens again, you may need to replace the coolant tank as the level sensor is built-in, sorry I did not think of that right off the bat, back in 2011 my A8l 4.2 had the tank level sensor get stuck, I would get the big red temp symbol in the drivers information screen, but the temp was fine and no overheating or hot for that matter, one time the symbol came on at cold startup, right then that led me to tank coolant level, it turned out someone prior to me had stuck the silicone cartridges into the tank, which then gunked up the float or sensor, so when my A8L W12 did thee same thing, I went for the tank, but no, it ended up being the G62 temp sensor.....