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It sounds normal to me. When more HP is needed, it turns the AC system off, which is a power robbing accessory. Every vehicle I've owned, to a point, suffers the same.
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 1987 560SL
85,000 miles
Meet on the level, leave on the square. Great words to live by
Were we directed from Washington when to sow and when to reap, we should soon want bread. - Thomas Jefferson: Autobiography, 1821.
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