You’re on the road for a few minutes before you notice a chill. You realize the car heater isn’t working. This frosty scenario makes driving on a cold day miserable. It’s a problem our Kennedy Transmission car mechanics take care of every winter here in the Minneapolis, MN, area.
What makes a good heater go bad? It could be one of several key components. When you turn on the heater, coolant moves through hoses from the engine and radiator to your vehicle’s heater core.
The heater core looks like a small radiator positioned against the firewall. As heated coolant moves through the unit, fans disperse the warmth into your car’s interior.
Use these steps to troubleshoot your car heater.
1. Check the Coolant
Low coolant can’t reach the heater core and generate warm air. Dirty coolant blocks proper circulation. Take a look at the level and condition of your engine’s coolant supply.
2. Assess the Heater Core
Make sure heater hoses are in good shape. Their mounting fittings should be tight and show no signs of leakage. Hold your hand above the hoses close to the firewall. If they aren’t hot, you may need to replace the heater core.
3. Inspect the Water Pump
A faulty water pump won’t circulate coolant through the system and back to the heater core. If the pump makes whining sounds or leaves wet spots on the garage floor, it could be the reason your heater doesn’t keep the car warm.
4. Listen to the Fan
If an air vent is not working, turn the heater and fan settings up all the way. Flip on the heater switch, and listen for the fan to engage. If it doesn’t come on, your heater problem could be somewhere in the car’s electrical system.
5. Look for Blown Fuses
Blown fuses can also result in heater trouble and result in air vents not working. Your owner’s manual is your best reference for finding fuses that drive the fan motor and control the heater switch. Most fuse boxes are located under the hood or under the dash just left of the steering wheel.
Frequently Asked Questions About Car Heaters
If your car’s heat is blowing cold air, it could be due to low coolant levels, a malfunctioning thermostat, air trapped in the cooling system, or a faulty heater core. Addressing these issues promptly can restore warm air and keep your car comfortable in colder weather.
Portable car heaters can pose safety risks, such as overheating, fire hazards, or electrical issues, especially if they lack proper safety features or are used incorrectly. Instead of relying on a portable heater, consider safer alternatives like heated car-compatible blankets or seat warmers. For long-term reliability and safety, consult a professional technician to diagnose and repair your car’s built-in heating system.
Get Professional Car Repair in Minneapolis Area With Kennedy Transmission
We want you to stay warm on the road, so let our expert car mechanics check that heater. Drop by our Minneapolis, MN, shop or any of our Kennedy Transmission locations state-wide. We’re here year-round for all your automotive needs with our wide variety of services and repairs.
