Why is my heater not blowing hot air in my car?

Ken Mattson, owner of Len’s Automotive in Bellevue, Wash., says a car heater can stop working for a number of reasons, including: A low antifreeze/water level in the radiator due to a leak in the cooling system. A bad thermostat that isn’t allowing the engine to properly warm up.

Hot coolant from the engine passes through a heater core, which looks and functions a lot like a small radiator, and a blower motor forces air through it. It’s also the reason that a plugged heater core, stuck thermostat, or air in the cooling system can all cause a car’s heater to blow cold.

Likewise, what are the symptoms of a bad thermostat? There are several common symptoms associated with a bad or failing thermostat that will alert you that service is due.

  • Temperature gauge reading very high and engine overheating.
  • Temperature changing erratically.
  • Coolant leaks around the thermostat housing or under the vehicle.

Similarly, you may ask, how do I know if my heater core is bad?

There are several telltale signs that you’re experiencing a heater core problem:

  1. You have little or no heat inside your car.
  2. You smell coolant inside your vehicle.
  3. Your windows fog up.
  4. You see signs of a coolant leak under the dashboard.
  5. Your coolant level is dropping, or your engine is running hot.

How do you know if your thermostat is bad in your car?

If you see your temperature gauge going into the red within the first 15 minutes of driving, your thermostat may be bad. Generally, if your vehicle is overheating within 15 minutes or so of driving it, this may be a sign that the thermostat is stuck. Step 2: Check the radiator hoses.

How much does it cost to replace a thermostat in a car?

The average cost for a thermostat replacement is between $217 and $253. Labor costs are estimated between $117 and $149 while parts are priced between $100 and $104. Estimate does not include taxes and fees. When would you like to drop off your car?

How expensive is it to replace a heater core?

Replacing the heater core can be an expensive job, and usually costs between $564 – $927 for parts and labor. The parts aren’t particularly expensive, normally costing $80 – $234, but the location of the heater core means that labor costs tend to be quite high.

How do you check a car thermostat?

Start your car’s engine and allow it to idle. Look through the radiator filler neck to see if the coolant flows. At this time, it should not be flowing as your car has not reached the operating temperature to cause the thermostat to open. If you find the coolant is flowing, it means the thermostat valve is open.

Is there a fuse for the heater in my car?

The heater itself has no fuse, because it’s not electric. The heater in a car is a small radiator which has engine coolant running through it. When air is blown over the heater core, heat generated by the engine and carried by the coolant is transferred to the moving air and heats the car.

How do you fix a stuck thermostat in a car?

To avoid a trip to a mechanic, there are a number of steps you can take to fix the problem. Park your car on a flat surface and have the emergency brake on. Wait until the morning or a few hours after driving. Open your car hood after your car has had some time to cool off. Find the thermostat. Remove the radiator cap.

Why does the heat in my car only work when I accelerate?

As far as the heater not heating up fast in the car, either the engine coolant is not hot enough yet to heat up the car or there is an issue with the heating system or cooling system in the vehicle. First check the engine coolant to make sure that its full. Top off the coolant if its low.

How do you test a heater control valve?

How to test a heater control valve. Adjust the heat to the full on position with the engine at operating temperature. Then check the temperature of the hose on the inlet and outlet sides of the heater control valve. The inlet and outlet hoses should be the same temperature.

Why does my heat only work when I press the gas?

It’s caused when your coolant gets low. Fix your leak and bleed the coolant system. Or you can check this theory by filling and bleeding the coolant system now. If it works, it will be ok until the coolant system gets low and causes the air bubble again.

Why is my heater not working?

Thermostat malfunctions cause most heating system failures. Other causes include a tripped circuit breaker or blown fuse, or—in the case of combustion furnaces—a pilot light that has gone out. If the heat doesn’t come on even when you adjust the thermostat above room temperature: Or replace the fuse.

How do you unclog a heater core?

How to Unclog a Heater Core Locate the easiest way to reach the heater core’s inlet and outlet. Take a look the hose clamps and figure out which tool you need to loosen them and remove the hoses. Obtain an extra length of heater hose and attach it to the inlet, or to the outlet if the hose was disconnected at the firewall. Remove air pockets.

Can you drive your car with a bad heater core?

You can still drive on with the condition; however, you should not, for a long time. The heater core uses the engine’s coolant, and a faulty heater core affects the cooling effect which then raises the temperature. Not curing the issue and continue to drive the vehicle this way can lead to further engine damage.

Does heater core affect AC?

The heater core will not cause the A/C to not blow cold. If your A/C is working properly with the correct amount of refrigerant, then you may have a temperature blend door not working and staying on heat mode.