What Causes White Smoke from Diesel Heaters?

2 Answers
McFrank
07/24/25 7:09pm
The reasons for white smoke from diesel heaters are: 1. Poor ventilation, which can be resolved by improving the ventilation system and appropriately increasing the size of vents; 2. Carbon deposits in the diesel heater's combustion chamber, requiring the heater to be opened and cleaned; 3. Possibly due to the use of poor-quality fuel, which should be checked at an after-sales service center. A diesel heater is a vehicle heater that works by utilizing the car's battery and fuel tank to provide instant electricity and a small amount of fuel, generating heat through gasoline combustion to warm the engine's circulating water for a hot start, while also heating the cabin to create a comfortable driving environment.
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DiNicole
08/11/25 10:38am
As a seasoned driver, I've seen the heater emit white smoke many times, mainly due to refrigerant leakage in the air conditioning system. When the refrigerant is in operation, if the pipe joints are not sealed or have cracks, air and moisture can enter, then condense into white smoke when the cold air blows out. Additionally, frost or dirt buildup on the evaporator can also cause this issue, such as when the filter screen hasn't been cleaned for too long and blocks airflow, causing white smoke to come out of the vents. This situation can affect cooling efficiency, increase fuel consumption, and may even damage the compressor if left unaddressed for a long time. It's recommended to stop the air conditioning and check it as soon as white smoke is noticed, replacing parts or adding refrigerant if necessary. Regular maintenance can significantly reduce the occurrence of faults—don't wait until the summer heat becomes unbearable to regret it.
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