Posted on 9/26/2025
You expect your car’s heater to work when temperatures drop. But when the vents start blowing cold air or no air at all, it’s uncomfortable and usually points to an underlying problem with your vehicle’s cooling, ventilation, or electrical systems. While some fixes are simple, others may involve critical engine components that affect overall performance. If you’re getting little or no heat in the cabin, here are five of the most common causes to consider. 1. Low Coolant Can Prevent the Heater from Working Your car's heating system uses hot engine coolant to warm the air that blows into the cabin. If the coolant level is too low, there may not be enough fluid circulating through the heater core. This can result in weak or no heat from the vents. Coolant loss may happen gradually due to a small leak or more quickly from a hose or radiat ... read more