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How to flush the heater: • How to flush the heater radiator WITHOUT REMOVING... If it is cold in your car, the interior heater does not work well, then do not despair ahead of time and rush to the nearest service to flush the radiator. There are several main reasons, the solution of which will almost always solve the problems with cold air from the air ducts. Flushing is the last thing you should do to improve the operation of the heater. First, you need to consider other possible malfunctions, such as the level of antifreeze, the operation of the thermostat and pump, the position of the heater radiator tap, etc. What is the reason when the heater is cold and the engine boils. The heater does not heat well. Reasons. #stove #cold #heater #car #reasons