Locations of potential sources of AAN coolant leaks?

[UrS4boy]

This was written for the AAN but it many things will translate to the 3B, ABY and ADU

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Quick answer is any of the hoses, pipes or devices shown in the diagram below *AND* the head gasket (maybe the No.1 source on an older AAN with the original paper and metal headgasket). More headgasket and headbolt info.

The rest of the usual suspects are below the diagram.



Turbo Coolant Feed and Return Lines

Feed:



Return (under intake manifold):



Heater and Radiator coolant systems

The overall coolant system with PNs

Heater Core DIY

HVAC Bleeder Valve

Heater Control Valve

Climate Control "Tee"

Expansion Tank/Reservoir

After-run pump and control module

Radiator

Water Pump

Thermostat, details, replacement, etc

Coolant Flange

20VT Water Manifolds

Casting plugs in the head

Frost plugs

[UrS4boy]

Hey guys. If you see that a hyperlink (an underlined bit of text) that I have tried to provide you (for more info on that subject) isn't working, please let me know. I just found out that none of them were working in this post. (Thanks to WORD find/replace ). They all work now and provide more info than just an item name.

Try the links. Please.

[hunker7]

All work for me Thanks for all this info Dave

BTW, would you have picture of correctly fitted turbo coolant pump, as mine seems to be sitting in weird angle, and hose seems to be slightly squished.

[UrS4boy]

All work for me Thanks for all this info Dave BTW, would you have picture of correctly fitted turbo coolant pump, as mine seems to be sitting in weird angle, and hose seems to be slightly squished.

From the working after-run pump hyperlink above:

After-run pump info: http://forums.quattroworld.com/s4s6/msgs/21503.phtml