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 MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTCOOLING SYSTEMWATER PUMPSERVICE AND REPAIR
1990 Chevrolet Lumina APV V6-191 3.1L
Water Pump: Service and Repair
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Service and Repair
Fig. 7 Water Pump Replacement:
1. Disconnect battery ground cable.
2. Drain engine coolant, then remove heater hose and serpentine belt shield.
3. With a 3/8 inch breaker bar or equivalent, relieve tension in serpentine belt tensioner, then remove serpentine belt.
4. Remove water pump pulley, then water pump, Fig. 7.
5. Reverse procedure to install.
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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.