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Illustration of Q7 TDI system and running gear

3213 Views 8 Replies 4 Participants Last post by  DUTCH VanAtlanta, 
chittychittybangbang
Found this being used as a greyed out background image and had to make a few photo edits to be able to clearly see the illustration. Here's a lower res edited version from Audi magazine:

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B
Are those 2 adblue tanks? That is a weird looking gas tank too. Er..diesel tank.
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chittychittybangbang
Yes. Many Audis have had upside down U gas tanks because of the driveshaft for quattro. Each side has a fuel pump. One is to move fuel to the other side of the U.
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F
Well there's your problem. The car blew up.
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DUTCH VanAtlanta
AdBlue Tanks Physical Location?

Anyone know where those two AdBlue tanks are physically located in the Q7? I looked underneath, but didn't see anything that looked likely. Besides, I'm thinking cold weather in the northern climes would necessitate a bit of protection from the cold.

Reason for asking is that is appears that the AdBlue must be drained and replaced with fresh fluid at the service interval, due to a shelf life on the fluid. I'm trying to determine where the drain would be located.

Any ideas? TIA!
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chittychittybangbang
Not sure but if you look through the Adblue FAQ it gives a video of draining using a suction pump on a Benz. In researching Adblue fluid safety and handling, I found that the Urea will come out of solution below 11oC. I don't know if the Touareg TDI and Audi Q7 Adblue tank are automatically heated even if the car is off but that makes the most sense to me. Otherwise it'll be all crystals and water at very cold temps. Does this mean that you have to leave a trickle charger on the car if temps get that low? If the adblue tank is heated even if the car is off, I'd say yes.

Here is another view with just the adblue tank and pump in place for just the Audi Q7 TDI.

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DUTCH VanAtlanta
chittychittybangbang said:
Not sure but if you look through the Adblue FAQ it gives a video of draining using a suction pump on a Benz. In researching Adblue fluid safety and handling, I found that the Urea will come out of solution below 11oC. I don't know if the Touareg TDI and Audi Q7 Adblue tank are automatically heated even if the car is off but that makes the most sense to me. Otherwise it'll be all crystals and water at very cold temps. Does this mean that you have to leave a trickle charger on the car if temps get that low? If the adblue tank is heated even if the car is off, I'd say yes.

Here is another view with just the adblue tank and pump in place for just the Audi Q7 TDI.
Click to expand...
Thanks. I'll have to look further over on the left (opposite side from the fuel filler) underside of the car.

I know it is heated, but there's no mention of a trickle charger in the owners manual.
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chittychittybangbang
Is it automatically heated at 11 degrees C even if the car is off or is the adblue tank only heated if the car is running?
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DUTCH VanAtlanta
chittychittybangbang said:
Is it automatically heated at 11 degrees C even if the car is off or is the adblue tank only heated if the car is running?
Click to expand...
At this point, I don't know. My guess is that it probably works pretty much the same as the Touareg AdBlue tank.

I will eventually find out, though.
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