2013 international pro star exaust fumes in cab

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{"text":"I have been getting raw exaust fumes in my cab when driving. Also when I am sitting idle .\nThis truck has been to a dealer for this problem,but the problem still exsist.\nFrom time to time when I am driving there is a rush of fumes into the cab.\nWhen I am idling I get them when I turn on the front hvac system through the vents. \nNot so much on the sleeper hvac.\nAny suggestion's on what's causing this , any known problems with this model?","pics":"[]","canComment":true}