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Home >> GMC >> 1993 >> Forward Control 7.4 N >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> A/C System General Servicing >> Trouble Shooting >> Expansion Or "H" Valve Stuck Closed Gauge Readings >> Correction

Expansion Or "H" Valve Stuck Closed Gauge Readings: Correction

  1. Evacuate system using vacuum pump.
  2. Charge system with R-12.
  3. Operate system and check performance.
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