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.
1998 Oldsmobile Cutlass BaseFACTORY OEM SERVICE PROCEDURE
Low Engine Coolant Indicator Malfunctions: Testing
- If BFC diagnostic system check was performed, go to next step. If BFC diagnostic system check was not performed, see procedures in BFC DIAGNOSTIC SYSTEM CHECK .
- Disconnect engine coolant level switch connector. Using scan tool, read BFC inputs. If low coolant level reads OFF, go to next step. If low coolant level does not read OFF, go to step 4).
- Replace engine coolant level switch.
- Back out BFC Pink 24-pin connector C3, terminal B6 (Yellow/Black wire). Using scan tool, read BFC inputs. If low coolant level reads OFF, go to next step. If low coolant level does not read OFF, go to step 11).
- Check for a poor connection at BFC connector C3, terminal B6 (Yellow/Black wire). If a poor connection exists, go to next step. If connection is okay, go to step 7).
- Repair poor connection at BFC connector C3, terminal B6 (Yellow/Black wire).
- Check for a poor connection at Yellow/Black wire terminal of engine coolant level switch. If a poor connection exists, go to next step. If connection is okay, go to step 9).
- Repair poor connection at Yellow/Black wire terminal of engine coolant level switch.
- Using DVOM, check resistance between engine coolant level switch harness connector "A" (Yellow/Black wire) and ground. If resistance is less than infinite, go to next step. If resistance is not less than infinite, go to step 11).
- Repair short to ground in Yellow/Black wire between BFC and engine coolant level switch.
- Replace BFC. See REMOVAL & INSTALLATION .
Factory Service Tools
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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.