While I don't have a direct answer to your question, I can tell you this much... smoke (or steam) coming out of the motor at any time in any place is NOT normal... I'd be VERY cautious of this bus...
You just might be a Redneck if...
...your motor home used to be a school bus!
...Your living room has a steering wheel!
...Your home has brake lights
1994 Jeep Grand Cherokee
1989 Thomas Diesel Pusher (Cat 3208/Freightliner)