Coolant Level Fault Indicator Test

Ensure the following fuses are intact and coolant level is full:

• 325 Series - No. 4, 5, 6 and 12
• 525i and 535i - No. 1, 15, 17, and 20
• 735i - No. 10 and 12

Use an ohmmeter to check switch. Switch closes when float is down (fluid low) and opens when float is up (fluid full). Sensor is an integral part of reservoir cap.