Challenger Clutch Fan vs Electric Fan: Understanding the Cooling System
All modern Challengers use electric cooling fans. Here's how the system works and what causes cooling problems.
All-Electric Cooling Fans Since 2008
Every generation of the fifth-gen Challenger (2008–2023) uses electric cooling fans — there is no belt-driven mechanical clutch fan. The fan is powered by the vehicle's electrical system and controlled by the PCM via the TIPM (Totally Integrated Power Module).
How the System Works
The PCM monitors coolant temperature and AC pressure to determine the required fan speed. The fan operates at variable speeds — not just high/low — matching demand:
- Low speed: Light cooling need, coolant at normal operating temp, AC off
- Medium speed: AC on, moderate temp
- High speed: High coolant temp, heavy AC demand, or coolant temp approaching threshold
Cooling System Components
- Radiator: Dissipates heat from the coolant
- Electric cooling fan assembly: Forces air through radiator when vehicle is stationary or slow
- Coolant pump: Belt-driven water pump circulates coolant
- Thermostat: Regulates coolant flow — stays closed until engine reaches operating temp
- Coolant reservoir: Expansion tank for coolant
Common Failure Points
Thermostat failure (stuck closed): Engine overheats rapidly. Coolant can't circulate to the radiator.
Thermostat failure (stuck open): Engine runs below operating temperature, poor fuel economy, heater blows cold.
Fan not activating: Check the fan fuse and relay in the TIPM first. Then check coolant temp sensor (sensor failure = PCM doesn't know to turn on the fan).
Radiator clogs: Coolant scale or debris clogs the internal passages. External blockage (bugs, leaves) easily cleaned with water. Internal clogs require radiator flush or replacement.
Coolant Flush Interval
Mopar HOAT (Hybrid Organic Acid Technology) coolant: First change at 150,000 miles or 10 years, then every 50,000 miles. Many enthusiasts flush every 5 years to prevent silicate buildup.
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