It,s your bunk heater when it,s system is flooded , white smoke comes out of a flex tube exhaust from heater. Here,s the fix dump trl. air , then disconnect glad hand , then set truck on high idle , then supply trl. air , then hold glad hand tight onto the flex pipe exhaust for 10- 30 seconds . Don,t always work , you sometimes have to repeat procedure. Make sure to keep one hand on the flex pipe. I was at roehl for a few days , went there to be a trainer , not my cup of tea . stay safe
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