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Home >> GMC >> 1987 >> Forward Control 6.2 J, Standard >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> General Servicing >> A/C System General Servicing >> Diagnostic Procedures >> Preparation For Testing

Preparation For Testing

  1. Attach Low and High side gauges.
  2. Start engine and allow it to warm up.
  3. Set system to COOL and blower to HIGH.
  4. Open car doors and hood.
  5. Run at fast idle for 2-3 minutes.
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