Now is a good time to make sure your car heater is working properly.
When checking your heater or using it for the first time this season, you may notice that cold air is blowing out of the vents. Here are some common causes:
It needs more coolant: Hot air generates from the heater core. Coolant, which runs through the engine and heater core, becomes hot. Coolant has to go somewhere, so if you need to add coolant, it’s likely that there’s a leak. Coolant leaks, which are also known as “water leaks”, can develop anywhere – the heater core, radiator, heater hoses, thermostat, and other areas.
Problems with the heater core: The heater core can become blocked by scale, which is debris created by a chemical reaction. If the heater core is blocked, coolant isn’t able to enter it and send cold or hot air through the vents.
The thermostat is malfunctioning: The thermostat expands and contracts, depending on the coolant’s temperature. If it’s stuck open, too much coolant is flowing, causing the engine temperature to stay too low. This can cause cold air to come through the vents. If the thermostat is stuck closed, the engine temperature becomes too hot.
Heater control is broken or blocked: The blendor actuator, or “blendor switch” – the knob on your dashboard – tells the actuator how much to open the door. This determines how hot or cold the air that enters your vehicle is. If it breaks or gets clogged, air – or the type of air you want – won’t flow through.
HomeTowne Auto Repair & Tire is an authorized Michelin and BFGoodrich tire dealer located in Woodbridge, Virginia. Automotive repair services are performed on all makes and models, including oil changes, brakes, alignments, inspections, and computer engine diagnostics.