Suspect my egr cooler is leaking and wondering how to test it if anyone can help mr ? Loosing coolant with no obvious leaks. Getting white smoke usually when cars just started and regens are happening more than often 

 

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Bypass the cooler so that no coolant runs through it; see if coolant loss ceases.

 

Can't offer detailed practical guidance on how to do it, but it probably involves a little plumbing ingenuity. 

Edited 21 December, 20241 yr by Breezy_Pete