Heater Relay
- Locate EFE heater relay under dash, above steering column. Disconnect heater relay 4-wire connector. Remove heater relay if necessary to access terminals.
- Using an ohmmeter, check continuity across relay terminals No. 3 and 4. Continuity should not exist.
- Energize relay by supplying battery voltage to relay terminal No. 1 and ground to terminal No. 2. Continuity should now exist between terminals No. 3 and 4. If relay does not function properly, replace relay.
Courtesy of FORD MOTOR CO.