KF55 - Check If Fan Continues To Run With Relay Disconnected

- Key "OFF".

- Low Fan Control (LFC) and High Fan Control (HFC) relays disconnected.

- Disconnect additional fan relay, refer to Testing Schematic. KF - Testing Schematic

- Key "ON".

- Does the fan continue to run?

Yes -- Service short to power in HFC power-to-fan circuit. Reconnect all components. Re-evaluate symptom.

No -- Key "OFF". Go to KF56. KF56 - Check AC Pressure Switch (ACPSW)