If it's a small leak, I'd try a can (or two) of "radiator stop leak" following the instructions exactly.
What have you got to lose?
I used it an older gas Class A with great results for 7 years.
I think GM used a can in every car they built--
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Max H,
2002 Newmar Mountain Aire, 37', 3778, W-22, 8.1 Vortac, Ultra Power upgrade, CAI (cold air intake), Taylor wires, colder plugs, Koni shocks.
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