Volkswagen United States said it is raising prices of most 1988 models by an average $248, or 2.2%, effective Monday. The cost of the Golf GL two-door is up $205 to $8,695. The larger Jetta has been raised by $205 to $9,195 for the two-door with a five-speed manual transmission, and the Vanagon GL van is up $350 to $16,590. The U.S. marketer of the German car maker said the price of its least expensive Golf subcompact is unchanged at $7,990. The prices of its Brazilian-built Fox subcompact models, which start at $6,290, are also unchanged.