Summer Heat Tips: Keeping Your Challenger Cool in Hot Weather

The Heat Problem

The Challenger's supercharged models (Hellcat, Redeye, Demon) are particularly susceptible to heat soak — the process where intake air temperature rises as the supercharger heats up under repeated hard use. Even naturally aspirated cars suffer from reduced power and comfort in extreme heat.

Heat Soak and the Hellcat

The 2.4L supercharger on Hellcat models generates significant heat under load. The intercooler spray system partially addresses this, but reservoir capacity is limited (~1.5 liters).

Tips:

• Keep the intercooler water reservoir full — especially before a track session
• Pre-chill the intercooler with ice water before a drag event (pour cold water into the reservoir)
• Allow cooldown laps between hard passes — 10-minute cool-down for every 2-minute hard run

Coolant System Check

In summer, a marginal thermostat, low coolant, or weak water pump becomes a bigger problem. Signs of cooling system strain:

• Temperature gauge creeping above normal during idle in traffic
• Heater blowing less heat
• Sweet coolant smell with no visible leak

Flush and fill with fresh OAT coolant every 5 years or 150,000 miles.

Oil and Transmission Temp

Track driving raises oil temps above the normal street range. Monitor with an oil temp gauge or OBD data logger. On HEMI engines, sustained oil temps above 250°F cause oil degradation. Consider an aftermarket oil cooler for dedicated track cars.

AC System Performance

Hot weather strains the AC compressor. If the AC underperforms in extreme heat:

• Check refrigerant level (R-134a on 2008–2021 models, R-1234yf on newer)
• Inspect condenser (in front of radiator) for bugs and debris blocking airflow
• Verify cooling fan operation at idle

Tire Pressure in Summer

Tire pressure increases roughly 1 psi for every 10°F rise in ambient temperature. Set pressures in the morning when tires are cold — don't bleed pressure from a hot tire.

Fuel Evaporation

Summer-blend fuels have lower volatility to control evaporative emissions. Switch to 93 octane from a high-turnover station in summer — stale fuel or low-quality 93 causes detonation more easily when intake air temps are elevated.