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Common to all nissans?
I have two nissans (97 Altima, and 91 Stanza.) Both do the same. When the cars idle drops, as when the power steering is being used at the same time the gas is being released, the temp coming from the vents drops. It corrolates with a drop in rpm. Watch the tach when you turn the wheel but release the gas to see if drops below normal rpms.
I think there was some concern about whether the draft was coming from the cab, or from the vent. If you meant the vent, which I think you did, when you turn, you take your foot off the gas and the rpms drop then the engine is strained by the power steering pump and the air temp suffers. It might just be common to all nissans.
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Defendthesecond
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