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 SYSTEMSERVICE AND REPAIR
1990 Chevrolet Lumina APV V6-191 3.1L
Cooling System: Service and Repair
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Service and Repair
1. Fill cooling system and leave radiator cap off.
2. Turn A/C-heater control to any A/C mode and set temperature to the highest setting.
3. Start engine and allow engine to idle until bottom radiator hose is hot.
4. Cycle engine speed up to 3000 RPM and back to idle five times. This should expel any trapped air in the system.
5. Refill radiator and install pressure cap.
6. Allow engine to return to outside temperature, then fill coolant reservoir to FULL COLD mark.
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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.