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Why is the heater not working after replacing the coolant?

1 Answers

SophieFitz

07/29/25 4:29pm

Common reasons for the heater not working after replacing the coolant are as follows: 1. Insufficient warm-up time: The engine coolant temperature has not risen. Unlike air conditioning, the heater requires the coolant temperature to rise before producing warm air. Turning on the heater switch too early can affect the temperature rise. 2. Thermostat failure: The thermostat is a temperature control sensor located above the radiator. If it fails, the temperature information reported to the computer will be incorrect, causing the cooling fan to operate, preventing the coolant temperature from rising and resulting in no warm air. 3. Recirculation issue: In some cases, the problem may be related to the recirculation mode. Switching to internal recirculation can help the temperature rise quickly.

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