FAQ: Why Does My Heater Blow Cold Air?

What do I do if my heater is blowing cold air?

When your furnace blows cold air, try turning the heating unit off and on. If the air feels warm for a moment or two, then switches to cold, it may be that the flame sensor is dirty. With a dirty flame sensor, your gas burner won’t stay lit, causing the air to go cold soon after the furnace turns on.

How do I stop my furnace from blowing out cold air?

Check the Thermostat Fan Setting Go to your thermostat and take a look at the fan setting. Make sure the switch is set to AUTO, not ON. With the AUTO setting chosen, your furnace should only run the fan during a heating cycle and not push cold air through your vents in between.

What to check if heat is not working?

Check the Batteries in Your Thermostat If your thermostat runs on batteries, try replacing them. You’d be surprised how many times this simple fix gets a heater going again. It may sound like a no-brainer, but you do need to turn your thermostat to the “heat” or “automatic” setting before your heater will click on.

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Why is my truck not blowing hot air?

If your car is not blowing warm air into the cabin and the coolant level is fine, then you could have an issue with your heater core. If you suspect that something is amiss with your car’s heater core, watch for these signs: Your car using coolant very quickly. The engine overheating.

Why is my furnace running but no heat?

Furnace filters Dirty filters are the most common cause of furnace problems. Dust and dirt restrict airflow—and if the filter gets too clogged, the heat exchanger will overheat and shut off too quickly, and your house won’t warm up. If the blower is running but no heat is coming out, replace the filter.

How do I reset my heating system?

How to Reset an Electric Furnace

  1. First, turn off the power supply to the furnace by turning off the breaker in the circuit box.
  2. Locate the reset button on the furnace and press it to reset the furnace.
  3. If the button is popped up, press it down.
  4. Return the cover to the blower compartment and turn the power on.

How do I reset my central heating system?

To reset the unit via wall control, turn the control OFF at the control, wait for thirty seconds, then turn the control ON. If there is no persisting problem, your unit should restart and work fine. If the issue persists, it’s time to call a service technician to assess the components.

Why my heater is not working?

Often, the issue is that the heating system is simply dirty. If your furnace has a dirty blower, the blower could cause equipment failure. In short, a dirty blower can cause the heat exchanger to fail. Dirty air filters could also be the reason your heater stopped working.

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How do I know if my heater core is clogged?

Heater core failure symptoms

  1. Weak or no airflow.
  2. Cold air (not warm) coming through the vents when the heater is on.
  3. Coolant leakage visible inside the cabin or a damp smell.

What are the signs of a bad thermostat?

Symptoms of a Failing Car Thermostat

  • The temperature gauge reads high and the engine overheats.
  • The temperature changes erratically.
  • The vehicle’s coolant leaks around the thermostat or under the vehicle.

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