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.
1996 GMC Yukon 2WD V8-5.7L VIN RFACTORY OEM SERVICE PROCEDURE
Troubleshooting Hints - Compressor Controls
1. CHECK A/C Compressor operations as per Heating, Ventilation, and Air Conditioning.
2. CHECK that HTR-A/C Fuse 12, IGN E MINI FUSE, and A/C COMP FUSE are not open. If any Fuse is open, LOCATE and REPAIR source of overload and REPLACE the Fuse(s).
3. CHECK that Grounds G104 and G105 (Diesel) or Grounds G103, G104, and G105 (Gasoline) are clean and tight.
4. CHECK that A/C Compressor Clutch Relay is properly mated to its connector.
5. CHECK condition of Diode 2 at the Underhood Fuse-Relay Center. REPLACE if either opened or shorted.
6. If the A/C Compressor is operating continuously, CHECK for short to ground on DK GRN/WHT (459) wire. If shorted to ground, LOCATE and REPAIR source of short.
- CHECK for broken (or partially broken) wire inside of insulation which could cause system malfunction but prove "GOOD" in a Continuity/Voltage check, with a system disconnected. These Circuits may he intermittent or resistive when loaded, and if possible, should be checked by monitoring for a Voltage drop with the system operational (under load).
- CHECK for proper installation of aftermarket electronic equipment which may affect the integrity of other systems (Refer "Troubleshooting procedures"). Diagnostic Aids
2. CHECK that HTR-A/C Fuse 12, IGN E MINI FUSE, and A/C COMP FUSE are not open. If any Fuse is open, LOCATE and REPAIR source of overload and REPLACE the Fuse(s).
3. CHECK that Grounds G104 and G105 (Diesel) or Grounds G103, G104, and G105 (Gasoline) are clean and tight.
4. CHECK that A/C Compressor Clutch Relay is properly mated to its connector.
5. CHECK condition of Diode 2 at the Underhood Fuse-Relay Center. REPLACE if either opened or shorted.
6. If the A/C Compressor is operating continuously, CHECK for short to ground on DK GRN/WHT (459) wire. If shorted to ground, LOCATE and REPAIR source of short.
- CHECK for broken (or partially broken) wire inside of insulation which could cause system malfunction but prove "GOOD" in a Continuity/Voltage check, with a system disconnected. These Circuits may he intermittent or resistive when loaded, and if possible, should be checked by monitoring for a Voltage drop with the system operational (under load).
- CHECK for proper installation of aftermarket electronic equipment which may affect the integrity of other systems (Refer "Troubleshooting procedures"). Diagnostic Aids
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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