Ford Explorer Police Intercept 2016–2018 — technical service bulletin
Bulletin 21B05 · NHTSA communication 10201080 · issued Aug 19, 2021
Technical service bulletin
communication type
Engine and Engine Cooling
component
2016–2018
model years
3
vehicle entries
Official summary
After extended idling, the high-speed cooling fan relay may fail in some of the affected vehicles. A failure will cause the fan to either continuously run or never turn on. A continuously running fan will increase the temperature of the relayâ s connections (terminals) to beyond their design maximum. This may eventually create an electrical arc which heats and damages the relay terminals. Customers may experience a drained battery and a non-functional or even a melted/burned high-speed cooling fan relay inside the battery junction box (BJB). A damaged non-functional relay causing the fan to ne
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.