Does Idling with the Heater On Harm the Car?
2 Answers
Idling with the heater on will slow down the engine's warming-up speed and increase fuel consumption, but it does not harm the car itself. Running the heater while idling is related to the car's displacement and engine tuning. Of course, the main impacts of idling are increased fuel consumption and engine carbon buildup, so it is advisable not to leave the car idling for extended periods. Turning on the heater while idling does not cause serious damage to the car, but it can affect the occupants. When the engine is idling, incomplete fuel combustion produces carbon monoxide. If the windows are closed, the concentration of carbon monoxide inside the car will gradually rise, potentially leading to carbon monoxide poisoning for the occupants.
As an ordinary car owner, I used to sit idle with the heater on during cold winters, feeling comfortable but later realizing it's unsafe and harmful to the vehicle. Prolonged idling leads to incomplete engine combustion, causing carbon buildup in the cylinders and spark plugs, which over time results in sluggish acceleration and increased fuel consumption. The operation of the fan and blower also drains the battery, placing extra strain on it, and older cars may struggle to start due to a drained battery. More seriously, there's a risk of carbon monoxide poisoning, especially in garages or enclosed spaces where exhaust fumes can silently accumulate and cause fainting—a close call experienced by a friend of mine. Now, I always drive slowly for a short distance after starting the engine, waiting until it runs efficiently before turning on the heater. This protects the car and saves money. I recommend everyone develop good habits and avoid small comforts that could lead to major hazards.
