Your Vehicle: 2009 Nissan-Datsun Altima V6-3.5L (VQ35DE)
 
Vehicle » Heating and Air Conditioning » Testing and Inspection » Symptom Related Diagnostic Procedures » Automatic Air Conditioner System » Insufficient Cooling » Trouble Diagnosis For Abnormal Pressure  
 
 
  Trouble Diagnosis For Abnormal Pressure  
 

INSUFFICIENT COOLING

Trouble Diagnosis For Abnormal Pressure

Whenever system's high and/or low side pressure is abnormal, diagnose using a manifold gauge. The marker above the gauge scale in the following tables indicates the standard (normal) pressure range. Since the standard (normal) pressure differs from vehicle to vehicle, refer to Ambient Air Temperature-to-operating Pressure Table above.

Both High- and Low-pressure Sides are Too High

  

High-pressure Side is Too High and Low-pressure Side is Too Low

  

High-pressure Side is Too Low and Low-pressure Side is Too High

  

Both High- and Low-pressure Sides are Too Low

  

Low-pressure Side Sometimes Becomes Negative

  

Low-pressure Side Becomes Negative