Keyword Analysis & Research: heater blowing cold air car


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What causes cold air to blow out of car heater?

What are the causes of a car heater blowing cold air? Problems with the engine's thermostat. The thermostat works as a valve to control the coolant flow to the radiator. ... Low coolant level. The coolant fluid is the source of heat supporting the heating system. ... Air bubbles in the cooling system. ... Issues with the heater core. ... Issues with the heater controls. ...

Why would a car heater blow cool air?

The heater core being clogged is another possible reason for the heater blowing cold air. If clogged, the coolant flowing through the heater core is stopped or slowed, resulting in cool air. A low coolant level also results in reduced flow to the heater core.

Why is my car heater not blowing hot air?

This is the reason that it takes a while for heaters to start blowing warm air. Until the engine warms up, there’s no heat for the heater core to extract. It’s also the reason that a plugged heater core, stuck thermostat, or air in the cooling system can all cause a car’s heater to blow cold.


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