Challenger Cooling Fan Upgrade: Electric Fan Conversions and OEM Fixes
The Challenger's cooling fan is electric on all models. Here's how it works, common failure points, and upgrade options.
Factory Cooling Fan Setup
The Challenger uses a single large electric cooling fan (with a secondary fan on some configurations) controlled by the PCM based on coolant temperature, AC load, and vehicle speed.
The fan module (TIPM — Totally Integrated Power Module) controls the fan. Fan speed is variable — not just on/off.
Common Fan Failures
Gradual overheating in traffic: Fan motor failing, spinning slower than commanded. Usually accompanied by higher-than-normal temperature gauge readings at idle.
Fan runs constantly: Normal when AC is on or coolant temps are high. Abnormal if it runs at high speed when cold — check coolant temp sensor.
TIPM failure: The TIPM controls fan operation. A faulty TIPM relay can cause the fan to not come on at all, leading to overheating in stop-and-go traffic. Replacing the TIPM is expensive ($300–600) but sometimes necessary.
Fan blade failure: Cracked or missing blade sections cause vibration and reduced airflow. Inspect if you hear an unusual noise from the front of the car at idle.
DIY Fan Test
With engine warm and AC off, the fan should run at medium-high speed. You can command the fan on via OBD-II bidirectional controls on compatible scanners (Autel, Launch). This confirms whether the fan motor itself works or if the problem is upstream (TIPM, wiring, sensor).
Performance Upgrades
The factory fan is adequate for stock and mildly modified cars. For track builds running sustained high loads:
Upgraded fan assembly: SPAL electric fans are the most popular upgrade — higher airflow rating (1,700–2,200 CFM vs OEM ~1,400 CFM), more durable motors.
Dual fan setup: Adding a second SPAL fan with a manual override switch gives you on-demand cooling during cool-down laps at the track.
Fan controller: Adjustable temperature fan controllers (Flex-a-lite, Derale) let you set the exact temperature at which the fan activates, ensuring earlier engagement under track conditions.
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