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HOMESERVICE MANUALSCHEVROLET2025TRAILBLAZER ACTIV, FWDREPAIR AND DIAGNOSISENGINE MECHANICALCOOLING SYSTEM (MECHANICAL)ENGINE HEATING AND COOLING SYSTEMREPAIR INSTRUCTIONSENGINE COOLANT FLOW CONTROL VALVE REPLACEMENT (L3T)INSTALLATION PROCEDURE
2025 Chevrolet Trailblazer ACTIV, FWD

Installation Procedure

2025 Chevrolet Trailblazer ACTIV, FWDSECTION Installation Procedure
  1. GM5129727Courtesy of GENERAL MOTORS COMPANY

    Water Outlet Seal (2) - Install NEW

  2. Engine Coolant Flow Control Valve (1) - Install
  3. GM5129724Courtesy of GENERAL MOTORS COMPANY

    Engine Coolant Flow Control Valve Bolt (1) - Install [5x] - Engine Coolant Flow Control Valve Installation

  4. GM5129723Courtesy of GENERAL MOTORS COMPANY

    Electrical Connector (2) @ Engine Coolant Temperature Sensor - Connect

  5. Electrical Connector (1) @ Engine Coolant Flow Control Valve - Connect [2x]
  6. GM5129722Courtesy of GENERAL MOTORS COMPANY

    Thermostat Bypass Hose (2) @ Engine Coolant Flow Control Valve - Install

  7. Hose Clamp (1) - Engage - Hose Clamp Replacement Guidelines - Spring Type 
  8. GM5125694Courtesy of GENERAL MOTORS COMPANY

    Evaporative Emission Canister Purge Pump (1) - Install - Evaporative Emission Canister Purge Pump Replacement (With Bracket)

  9. GM5129717Courtesy of GENERAL MOTORS COMPANY

    Engine Coolant Flow Control Valve Hose (4) @ Engine Coolant Flow Control Valve - Install

  10. Thermostat Bypass Hose (3) @ Engine Coolant Flow Control Valve - Install
  11. Engine Oil Cooler Coolant Inlet Hose (2) @ Engine Coolant Flow Control Valve - Install
  12. Hose Clamp (1) - Engage [3x] - Hose Clamp Replacement Guidelines - Spring Type 
  13. GM5245790Courtesy of GENERAL MOTORS COMPANY

    Radiator Inlet Hose (2) @ Engine Coolant Flow Control Valve - Install

  14. Hose Clamp (1) - Engage - Hose Clamp Replacement Guidelines - Spring Type 
  15. GM5287108Courtesy of GENERAL MOTORS COMPANY

    Radiator Assembly (1) - Install - Radiator Replacement 

  16. Oil Level Indicator Tube - Install - Oil Level Indicator Tube Replacement
  17. Fill the cooling system. Cooling System Draining and Filling (GE-47716 L3T) , or Cooling System Draining and Filling (Static L3T) 
  18. Perform the following action: Engine Coolant Control Valve Learn 
  19. Start the engine and check for leaks.
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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.