Hyundai Coupes/Sedans 1986-1993 Repair Guide

High Altitude Compensation (HAC) Valve

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TESTING



  1. Remove the HAC and inspect for deformation or cracks.
  2.  
  3. Clean the air filter in the valve.
  4.  
  5. At altitudes below 3900 ft., the valve should leak vacuum at the lower nipple and hold vacuum at the upper nipple.
  6.  
  7. At altitudes above 3900 ft., the valve should hold vacuum at the lower nipple.
  8.  

 
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