Know Why Your Car Heater Isn't Working & Blowing Cold Air!


It gets hard to drive during the winter season, mostly when the car heater or defroster doesn't work.

The odds of it not working suggests that something went wrong with it.

It indicates that something around the heater or within is causing it and not keeping people in the car toasty.

Major 5 Reasons That Are The Reason Behind Your Car Heater Blowing Cold Air

1. Coolant Isn't Enough

Your car utilizes coolant generally of 50% water & 50% antifreeze composition to cool your engine off, particularly during the summer season. 

When you start the car heater to warm up space during the winter months, then internally, the coolant goes over the engine to the heater center that then blows warm air into your vehicle. 

It can feel cool for an initial couple of moments as the engine needs to warm up for the coolant to warm up and give warmth to your vehicle's interior. 

If cold air continuously blows, then the necessary thing to check is the coolant level. 

When the vehicle is low on coolant, it won't send any to the heater center to produce warm air.

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2. Heater Core Issues

Vehicle heater issues are often related to heater core problems. 

It can also be because coolant is not flowing via the heater's core appropriately, or the blower engine's air isn't reaching it, or there's a clog in the heater core's small tubing. 

Heater cores are precisely a cooling system component resembling compact radiators. It flows through the aluminum or brass material tubing that carry the hot coolant in and out, with fans dispersing the coolant released heat. 

The heating cores also help defrost the vehicle with other associated heating actions and are generally located exactly in dashboard backs.

In case the system isn't blasting warm air in the interior of your vehicle and yet after checking you find the coolant level, then there is some issue with your heater core.

To detect the heater core issues, you need to look for symptoms like the engine overheating, fruity & sweet-smelling odor, the car's interior is foggy, and the coolant is used by your car way too quickly.

3. Heating Controls Broke or Got Clogged 

After using the control buttons for many years, they might get gummed up and discontinue work. 

On the off chance the coolant levels are right, and there doesn't appear to be an issue with your heater core, you might require to replace the heater control valve or control buttons.  

The heater control valve is positioned just under your hood that helps you regulate the heat off or on via a switch.

In case that piece isn't working correctly, then your vehicle will get held by cold air blowing in the vehicle's cabin.

4. Dysfunctional Thermostat

In case you observe that your thermostat gauge remains on the "C" even following the engine has the moment to warm up, or you may have a broken thermostat. 

If the thermostat isn't able to signal the vehicle, then the coolant will not flow over to give heat to your heater core, and the air will remain cold. 

Thermostats are generally a simple and cheap fix, so the installation of another one so that your heater works swiftly again.

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5. Water Leaks

The most general issue with car heaters is the water leak, but there are numerous spots from where the leaks can occur.

Hence, it is better to inspect your radiator, hoses, and water pump for damage. Your car heater will not operate correctly if any of the three are leaking.

An efficient heating system is to make driving during the winter season enjoyable and cozy.

In case you see that there are any problems or the heat doesn't blow out of the vents, it is best to contact a professional and credible automotive repair shop to check your heating system.

It is essential to address the issues with car heaters because if you neglect and overlook it, it might turn into a significant problem, costing you a lot to get it fixed.

How Can You Detect The Cause By Yourself?

To begin with, examine the coolant level when the engine is cold. And if it's low, it probably won't have the option to heat the heater core, regardless of whether it's doing an excellent job to prevent the engine's overheating. 

The thermostat of the cooling system likewise might be hindering the circulation of the coolant. There's a decent possibility your engine will be running a risk of overheating in the latter case.

If neither of those is the reason, at that point, the heater core and ancillary parts are likely guilty parties. 

If the hot coolant isn't flowing through the heater core, maybe a valve isn't opening to permit its movement. 

The core itself is spilling or stopped or building up an airtight chamber if the air didn't appropriately drain after maintaining the cooling system.

Another chance is that a diverter or door regulating warm air into the inside is trapped, hindering, forestalling an adequate airflow. 

On vehicles with programmed temperature control, a "set-and-fail to remember" include expected to keep up a steady temperature, the PC that controls the framework may glitch. 

There is a set & forget feature on cars with automatic temperature control that maintains a consistent temperature. At times the computer controlling it might malfunction. 

The heater core and other parts may be fine, but the computer has grown tired of continually catering to your climate needs and stopped answering your calls.

Parting Thoughts

Diagnosing and fixing such auto repairs can be complicated. 

Many customers avoid seeking professional help for these auto repairs. 

In case you search the internet, you will discover many examples of do-it-yourselfers, but their heater still blows cold air, and despite all that effort, it remains unresolved.

Contact A&G Customs for professional automotive repairs in Doylestown for car heater repairs.

We give a broad array of automotive services, including restorations, brake repair, inspections, auto bodywork, towing, custom paint, and general maintenance.