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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2025TRAILBLAZER ACTIV, FWDREPAIR AND DIAGNOSISENGINE MECHANICALCOOLING SYSTEM (MECHANICAL)ENGINE HEATING AND COOLING SYSTEM
2025 Chevrolet Trailblazer ACTIV, FWD
Engine Heating And Cooling System
2025 Chevrolet Trailblazer ACTIV, FWDSECTION Engine Heating And Cooling System
- Specifications
- Schematic Wiring Diagrams
- Diagnostic Information and Procedures
- DTC P00B2
- Diagnostic Instructions
- DTC Descriptor
- Typical Scan Tool Data
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Actions Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Component Testing
- Repair Instructions
- DTC P00B3 - P00B5 (L3Z)
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Typical Scan Tool Data
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Actions Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC P0480, P0494, P0691, P0692, P30EE, P30EF, or U0632 - Cooling Fan Malfunction (LBP / L3T)
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Actions Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC P1098, P10A1, P23C4 - P23C6, P26B7, P26BB, P2DE7, or U0617
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Actions Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- Additional Procedures
- DTC P1387, P26C0, P26C2, P29FA, P29FB, P2DE8, P2E81, or U0618
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Actions Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- Additional Procedures
- DTC P261F, P2B86, P2B87, P3077, P3078, or U0623
- DTC P26CE, P2B85, P2BA2, P2DE9, P2E82, P3071 - P3076, or U0672
- Symptoms - Engine Cooling
- Engine Overheating
- Loss of Coolant
- Pressure Cap Testing
- Radiator Surge Tank Cap Testing
- Cooling System Leak Testing
- DTC P00B2
- Repair Instructions
- Engine Coolant Control Valve Learn
- Engine Coolant Pump Data Reset
- Hose Clamp Replacement Guidelines - Spring Type
- Cooling System Draining and Filling (GE-47716 LBP)
- Cooling System Draining and Filling (Static LBP)
- Cooling System Draining and Filling (GE-47716 L3T)
- Cooling System Draining and Filling (Static L3T)
- Coolant System Flushing
- Engine Radiator Cleaning
- Radiator Surge Tank Replacement
- Radiator Surge Tank Outlet Hose Replacement (L3T)
- Radiator Surge Tank Outlet Hose Replacement (LBP)
- Radiator Inlet Hose Replacement (L3T)
- Radiator Inlet Hose Replacement (LBP)
- Radiator Outlet Hose Replacement (L3T)
- Radiator Outlet Hose Replacement (LBP)
- Exhaust Manifold Outlet Pipe Replacement (L3T)
- Engine Coolant Flow Control Valve Replacement (L3T)
- Engine Coolant Flow Control Valve Hose Replacement (L3T)
- Radiator Lower Bracket Replacement - Left Side
- Radiator Lower Bracket Replacement - Right Side
- Radiator Upper Bracket Replacement - Left Side
- Radiator Upper Bracket Replacement - Right Side
- Engine Oil Cooler Replacement (L3T)
- Engine Oil Cooler Replacement (LBP)
- Engine Oil Cooler Coolant Inlet Hose Replacement (L3T)
- Engine Oil Cooler Coolant Outlet Hose Replacement (L3T)
- Engine Oil Cooler Inlet Pipe Replacement (L3T)
- Engine Oil Cooler Outlet Pipe Replacement (L3T)
- Engine Coolant Fan Replacement
- Fan Control Module Replacement (LBP)
- Turbocharger Coolant Feed Pipe Replacement (LBP)
- Turbocharger Coolant Feed Hose Replacement (L3T, FWD)
- Turbocharger Coolant Feed Hose Replacement (LBP)
- Turbocharger Coolant Feed Hose Replacement (L3T, AWD)
- Turbocharger Coolant Return Pipe Replacement (LBP)
- Turbocharger Coolant Feed and Return Pipe Replacement (L3T)
- Turbocharger Coolant Return Hose Replacement (L3T)
- Turbocharger Coolant Return Hose Replacement (LBP, Turbocharger to Turbocharger Coolant Return Pipe)
- Turbocharger Coolant Return Hose Replacement (LBP, Water Outlet to Engine Coolant Air Bleed Hose)
- Turbocharger Coolant Return Hose Replacement (LBP, Water Outlet to Turbocharger Coolant Return Pipe)
- Thermostat Bypass Hose Replacement (L3T, Engine Coolant Flow Control Valve to Water Pump)
- Thermostat Bypass Hose Replacement (L3T, Exhaust Manifold Outlet Pipe to Engine Coolant Flow Control Valve)
- Engine Coolant Thermostat Replacement (LBP)
- Engine Coolant Air Bleed Hose Replacement
- Water Outlet Replacement (LBP)
- Thermostat Bypass Pipe Replacement (LBP)
- Heater Outlet Pipe Replacement
- Water Pump Pulley Replacement (LBP)
- Electric Engine Coolant Pump Replacement
- Water Pump Replacement (LBP)
- Water Pump Housing Replacement (LBP)
- Water Pump Outlet Pipe Replacement (L3T, Primary)
- Water Pump Outlet Pipe Replacement (L3T, Secondary)
- Engine Coolant Temperature Sensor Replacement (LBP)
- Engine Coolant Temperature Sensor Replacement - Radiator
- Engine Coolant Temperature Sensor Replacement - Heater Outlet Hose
- Engine Coolant Temperature Sensor Replacement - Engine Coolant Flow Control Valve (L3T)
- Radiator Replacement
- Radiator Air Lower Baffle Replacement
- Radiator Air Upper Baffle Replacement
- Engine Coolant Heater Replacement (L3T)
- Engine Coolant Heater Replacement (LBP)
- Description and Operation
- Special Tools and Equipment
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.