Does turning on the heater when starting the car consume more fuel?

2 Answers
LeAndres
07/29/25 2:18am
Turning on the heater when starting the car does not consume more fuel. Here are some considerations regarding using the car heater: 1. No need to activate the compressor: The car heater used in winter is a non-independent residual heat heating system, which utilizes the heat emitted by components like the radiator and exhaust pipe to warm the air, which is then blown into the cabin by the fan. Therefore, using the heater does not require activating the compressor. 2. Avoid turning on the heater immediately: Since the water temperature in the radiator is still low when the car is just started, you need to wait for the water temperature to rise before warm air can be blown out. Moreover, turning on the heater at this time not only results in cold air but also increases the engine's burden, causing the water temperature to rise more slowly. Therefore, it is advisable to let the car run for a while and wait until the water temperature gauge reaches half of the normal operating temperature before using the heater. Additionally, after turning on the heater, use the external circulation first to refresh the air inside the cabin, then switch to internal circulation after a few minutes. 3. Using the heater does not increase fuel consumption: The heater relies on heat exchange from components like the radiator and exhaust pipe. Apart from the fan, it hardly uses any other equipment, so it does not lead to increased fuel consumption.
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StAnnie
08/12/25 6:16am
Turning on the heater is actually a clever technical skill! As experienced drivers know, when the car is first started, the engine is still cold. Turning on the heater at this time forces the radiator to cool down, causing the engine to burn more fuel to maintain its operating temperature. However, after driving for about 10 minutes when the water temperature gauge reaches the midpoint, the heating system utilizes the waste heat naturally produced by the engine, with almost no impact on fuel consumption. The key trick is not to turn on the heater immediately after getting in the car, but to wait until the water temperature rises before enjoying the warmth. I've tried it before—on cold winter mornings, turning on the heater prematurely can increase fuel consumption by half a liter per 100 kilometers.
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