What is the Temperature Inside a Car Trunk When It's 40 Degrees in Summer?

1 Answers
DelRosalie
07/29/25 4:17pm
During summer when the outdoor temperature reaches around 40 degrees Celsius, the temperature inside a car trunk can rise to approximately 50 degrees. In most regions during summer, prolonged exposure to direct sunlight combined with the fact that car interiors are predominantly black (which absorbs heat more readily) and the enclosed nature of vehicles leads to rapid temperature increases. Here are solutions to address excessive summer car heat: 1. Park with the rear facing the sun: Choose shaded parking spots whenever possible. If unavoidable, position the car's rear toward sunlight since rear windows are smaller, minimizing solar penetration and heat accumulation compared to front-facing parking. 2. Water spray cooling: Spray water (preferably mixed with alcohol for better heat absorption and evaporation) inside the vehicle. Note: Pure alcohol has a flashpoint of 75°C - lower concentrations have higher flashpoints. Recommended: Use 75% medical alcohol diluted 1:10 with water. 3. Door fanning: Open all doors and repeatedly swing them to manually expel hot air, quickly reducing interior temperature (avoid this method with butterfly/vertical doors). 4. Air circulation: Begin by opening windows for ventilation, activate external AC circulation after engine stabilization, then switch to internal circulation when temperatures equalize - this is standard cooling practice.
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