TwinTurbo.NET: Nissan 300ZX forum - If sounds like you may have the auto climate
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Subject If sounds like you may have the auto climate
     
Posted by DAYTONAZ on January 04, 2019 at 6:03 PM
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In Reply To Rookie with high idle posted by Thebigfig on December 28, 2018 at 08:04 PM
     
Message control system. When you select defrost it engages the a/c compressor. When the a/c compressor engages the IACV adjusts the idle up to compensate for the additional load of the a/c compressor. If the a/c compressor is not engaging and thereby creating a drag on the engine the idle will ramp up as a result. To check for this warm up the car and turn on the a/c or defrost. Look at the front of the a/c compressor and observe whether the clutch is engaged.

     
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