Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1995VANDURA SPECIAL 7.4 NREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHVAC SYSTEM - G SERIES VANTESTINGA/C SYSTEM PERFORMANCE
1995 GMC Vandura Special 7.4 N
A/C System Performance
1995 GMC Vandura Special 7.4 NSECTION A/C System Performance
- Park vehicle out of direct sunlight. Open windows and doors to ventilate interior. Vent engine exhaust, if necessary. Install manifold gauge set. Note ambient temperature and relative humidity.
- Close all windows and doors. Place mode selector lever in NORM A/C position, blower switch lever in HI position, and temperature control lever in full COLD position.
- Insert A/C Diagnostic Tester (J 21213-A) into right center vent. Place transmission in Park or Neutral. Start engine and allow it to run at 2000 RPM until temperature tester reaches lowest temperature (approximately 3 minutes). See A/C SYSTEM SPECIFICATIONS table.
A/C SYSTEM SPECIFICATIONS
| Ambient Temperature | Low Side Pressure | High Side Pressure | Air Outlet Temperature | ||
|---|---|---|---|---|---|
| F° (C°) (1) | psi (kg/cm2 ) | psi (kg/cm2 ) | °F (°C) | ||
| 70 (21) | 32 (2.5) | 240 (17) | 50 (10) | ||
| 80 (27) | 37 (2.6) | 290 (20) | 56 (13) | ||
| 90 (32) | 44 (3.0) | 340 (24) | 63 (17) | ||
| 100 (38) | 55 (3.9) | 395 (28) | 75 (24) | ||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.