Any of a number of factors can be found to be the primary cause of a faulty object. Let's look at the reasons why your car's heating system isn't working properly to help you diagnose it.

Faulty Thermostat

The most typical cause of your car's failing heat is a malfunctioning or broken thermostat. The part might cause problems with your heat as well as your engine's cooling system if it is jammed open or closed. One becomes a matter of comfort, while the other becomes a matter of "Oh no, my engine is broken."

Low Antifreeze/Coolant

Low antifreeze or coolant is the second most common problem. When the coolant/antifreeze levels fall below a certain level, the hot fluid cannot reach the heater core, and the cabin remains cold. This can occur if the engine is overworked and overheats, or even if it isn't adequately fueled.

Heater Fan That Isn't Working

While heated coolant/antifreeze may be injected into the heater center, the heater fan, which is responsible for blowing the heat into a cabin, may break or experience an electrical short.

Blower Motor Resistor Fault

You may have trouble setting the speed of a fan or obtaining any air at all if the blower motor resistor is faulty.

Heater Core Is Clogged

Debris and particles that make their way into a coolant system may sometimes clog the heater core. This happens less frequently than the other problems. This can happen when a radiator does rust from the inside or when debris passes via the radiator and lodges in the heater core. In either case, you'll need to either repair or replace your heater core.

Leaky Radiator

A leaking radiator could stop coolant from entering your heater core and, in the worst-case scenario, harm your engine.

HVAC Controls That Aren't Working

Simply said, the heating system may sometimes not be triggered by your car's buttons, knobs, or even haptic feedback touchscreens. Short circuits, broken dials, and faulty touchscreens can all cause your heater to stop operating.

Blown Fuses or Faulty Wiring

Your car's wiring, like your faulty HVAC controls, could be malfunctioning or have a short. This means that the heating isn't turned on when the driver tells it to. This isn't good.

How to Repair a Broken Thermostat

The Drive put up an easy-to-follow tutorial on how to repair a broken thermostat to ease your fix-it anxieties and show you just how simple DIY fixes can be. You'll need to buy a new coolant as well as a new thermostat.


Working on your automobile can be hazardous and nasty, so here's what you'll need to avoid dying, being maimed, or losing a finger while keeping your shirt, jeans, and skin spotless—hopefully.

What You'll Need to Repair a Broken Thermostat

We're not psychics, and we're not rummaging through the toolbox or garage, so here's everything you'll need.

List of Tools
• Drain bucket

• Selection of wrenches

List of Parts

• Coolant

• A new thermostat

• Organizing the tools and gear so that everything is easily accessible can save you valuable minutes while you wait for your handy kid or four-legged helper to give you the blowtorch or sandpaper. (A blowtorch isn't required for this task.)

• A flat workspace, like a garage floor, street parking, driveway, is also required. Because we aren't getting the ride out of the clink, check the local regulations to ensure you are not breaking any regulations when using the street.

Why is my car heat not working?