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Hi, I have a V6 supercharged VY Calais when sitting in traffic, thermo fans come on then engine warning light comes on with a slightly rough idle. When the car cools down the warning disappears. Sit in traffic again, same thing happens. Any ideas ??

Hi. I have a VY V6 Supercharged calais. When the car gets hot sitting in traffic and the thermo fans cut in, the engine warning display comes on and the idle seems to be slightly rough. When the car gets going and cools down the warning goes away, or if i turn the car off then on again it won't...