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.
2002 Pontiac Aztek FWDFACTORY OEM SERVICE PROCEDURE
Section 546 (Engine Cooling System)
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Engine Cooling
- Diagnostic System Check - Engine Cooling
- Scan Tool Output Controls
- Scan Tool Data List
- Scan Tool Data Definitions
- Diagnostic Trouble Code (DTC) List
- DTC P0480: Improper Voltage Level From Low Speed Cooling Fan
- DTC P0481: Improper Voltage Level From High Speed Cooling Fan
- Symptoms - Engine Cooling
- Engine Coolant Temperature Indicator Always On
- Low Engine Coolant Indicator Always On
- Cooling Fan Always On
- Cooling Fan Inoperative
- Engine Overheating
- Loss of Coolant
- Thermostat Diagnosis
- Coolant Heater Inoperative
- Engine Fails To Reach Normal Operating Temperature
- Pressure Cap Testing
- Coolant Leak Testing
- Repair Instructions
- Draining And Filling Cooling System
- Flushing
- Radiator Cleaning
- Coolant Level Module Replacement
- Coolant Recovery Reservoir Replacement
- Radiator Hose Replacement - Inlet (3.1L)
- Radiator Hose Replacement - Inlet (3.8L)
- Radiator Hose Replacement - Outlet (3.1L)
- Radiator Hose Replacement - Outlet (3.8L)
- Throttle Body Heater Hose Replacement - Inlet
- Throttle Body Heater Hose Replacement - Outlet
- Cooling Fan Replacement - Electric
- Cooling Fan Motor Replacement - Electric
- Thermostat Replacement (3.1L)
- Thermostat Replacement (3.8L)
- Thermostat Bypass Pipes Replacement
- Water Pump Replacement (3.1L)
- Water Pump Replacement (3.8L)
- Drain Cock Replacement
- Fan Shroud Replacement
- Radiator Replacement
- Radiator Air Baffle and Deflector Replacement - Lower
- Radiator Air Baffle and Deflector Replacement - Side
- Coolant Heater Replacement (3.1L)
- Coolant Heater Replacement (3.8L)
- Coolant Heater Cord Replacement (3.1 L)
- Coolant Heater Cord Replacement (3.8L)
- Description and Operation
- Cooling System Description and Operation
- Special Tools and Equipment
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.