What Causes No Warm Air from Car Air Conditioning?
2 Answers
The reasons for no warm air from car air conditioning are: 1. Engine thermostat failure; 2. Hot water valve or hot water valve vacuum actuator failure; 3. Heater inlet/outlet hose blockage or heater core clogged with deposits; 4. Temperature control damper or control cable damage; 5. Air conditioning blower damage or blower control circuit malfunction; 6. Air conditioning air distribution pipe blockage or air leakage. Car air conditioning refers to the air conditioning device installed in vehicles, which can cool, heat, ventilate, and purify the air inside the cabin, providing a comfortable environment for passengers, reducing driver fatigue, and improving driving safety.
When my car's AC doesn't blow warm air, I usually check the coolant level first. The heating system relies on engine heat transferred through coolant to the AC system. If there's insufficient coolant or air in the system, the heat can't transfer properly, leaving the air cold. Last winter during a long road trip, my AC kept blowing cold air. Upon checking, I found the coolant reservoir alarmingly low - thankfully topping it up at a roadside gas station solved the issue. If the coolant level is normal, the thermostat might be faulty. It regulates coolant flow, and if stuck open, the engine won't reach proper temperature and the AC won't heat. In such cases, try turning off the engine briefly before restarting, or check if the fan operates normally. Getting only cold air from vents is troublesome, especially during cold snaps when driving safety is crucial. I recommend visiting a repair shop for professional diagnosis as soon as possible.
