Compression Ignition Addict
Join Date: Nov 2007
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In the valley you have the EGR cooler. There is an o-ring that seals the connection into the intake (doubt that is leaking unless you have had work done recently).
On the other side of the EGR cooler, there is a hose (orange or blue depending on what year you have). That hose could have gotten cut.
There is also, a hose that is on top of your intake manifold that goes back to the Degas bottle.
Then you, also, have the oil cooler, which flows coolant.
In addition to these places to look, there is a seal that is between the front cover and intake manifold. If you have had work done recently, that may be leaking (generally when they leak, THEY REALLY LEAK.