What are the symptoms of a bad EGR cooler?
There are three main symptoms of a bad EGR cooler.

They include:
a. The unexplained loss of coolant from your degas (or overflow) bottle. Said another way, your coolant is low in the overflow bottle, but yet you can't find the coolant leaking from anywhere.

b. White "smoke" (actually steam) coming out of the exhaust pipe.

c. Coolant/moisture in your intake manifold is visible when you remove your EGR valve. You might also observe thick, wet black sludge and/or what appears to be an internal section of your intake manifold that has been "steam cleaned".

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