What is the reason for no warm air after replacing the coolant?

1 Answers
Dawn
07/25/25 4:37am
No warm air after replacing the coolant is due to air trapped in the heater core. This occurs when the system is not properly purged of air before adding new coolant. When replacing coolant in the cooling system, it's necessary to bleed the air. The lack of warm air indicates air pockets in the system creating vapor lock, preventing proper coolant circulation. The solution is to visit a repair shop to remove the outlet pipe of the heater core and add coolant to purge the air. Coolant, whose full name is antifreeze coolant, is a liquid with antifreeze properties that prevents freezing during cold winters, which could otherwise crack the radiator or damage the engine cylinder block or head.
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