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 MANUALSCHEVROLET2013SILVERADO 2500 HD LT, 2D CAB CHASSIS, 6.6L ENG VIN 8, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSWIRING DIAGRAMSWIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - FUEL PUMP/TRAILER BRAKE CONTROL MODULE TO RADIO X1 (UYS)COMPONENT CONNECTOR END VIEWSHVAC CONTROL MODULE X3 (C67, C42, CJ2 OR MEX)
2013 Chevrolet Silverado 2500 HD LT, 2D Cab Chassis, 6.6L Eng VIN 8, RWD
HVAC Control Module X3 (C67, C42, CJ2 or MEX)
2013 Chevrolet Silverado 2500 HD LT, 2D Cab Chassis, 6.6L Eng VIN 8, RWDSECTION HVAC Control Module X3 (C67, C42, CJ2 or MEX)
Connector Part Information
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Terminal Part Information
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HVAC Control Module X3 (C67, C42, CJ2 or MEX)
| Pin | Wire | Circuit | Function |
|---|---|---|---|
| 1 | 0.35 TN | 518 | Lower Left Air Temperature Sensor Signal (CJ2) |
| 2 | 0.35 YE/BK | 713 | Defrost/Heater Mode Valve Position Sensor Signal |
| 3 | 0.35 PU | 1838 | Recirculation Door Position Signal (CJ2) |
| 4 | 0.35 GY/BK | 754 | Blower Motor Speed Control |
| 5-9 | - | - | Not Used |
| 10 | 0.35 GY | 598 | 5-Volt Reference |
| 11 | 0.35 TN | 520 | Lower Right Air Temperature Sensor Signal (CJ2) |
| 12 | 0.35 L-BU | 733 | Air Temperature Door Position Signal (CJ2) |
| 13 | 0.35 D-BU | 1646 | Right Air Temperature Door Position Signal |
| 14 | 0.35 D-BU | 204 | A/C Refrigerant Pressure Sensor Signal (HP2) |
| 0.35 WH | 2622 | Evaporator Temperature Sensor Signal (except HP2) | |
| 15 | 0.35 TN | 2273 | Mode Door Control |
| 16 | 0.35 D-BU | 1199 | Left Air Temperature Door Control (CJ2) |
| 17 | 0.35 D-GN | 1614 | Recirculation Door Control (CJ2 or C67 except MEX, or MEX without C42) |
| 18 | 0.35 WH/BK | 1236 | Right Air Temperature Door Control |
| 19 | 0.5 TN | 914 | Low Reference (HP2) |
| 0.35 TN | 552 | Low Reference (C67) | |
| 20 | 0.35 YE | 1791 | Low Reference |
RENDER: 1.0x
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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.