Why Does the Car Air Conditioner Only Cool but Not Heat?

[AlexaMarie]

Here are the detailed reasons why the car air conditioner does not produce heat: 1. Poor operation of the heating control mechanism leads to insufficient heating. 2. Issues with the engine cooling system cause the car heater to not produce heat. Below is a detailed explanation of the car heating system: 1. Check the temperature of the two inlet pipes of the heater core. If both pipes are hot, the problem lies with the airflow control mechanism. Conversely, if both pipes are cold, or if one is hot and the other is cold, the issue is with the cooling system. 2. The car heater uses a blower to direct heat from the heater core into the cabin. If the airflow is insufficient or the distribution of hot and cold air is poor, preventing the heat from the heater core from being effectively released, the temperature of the heater will not rise.