Why does my car heater work intermittently?

Why does my car heater work intermittently?

A 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. A blower fan that isn’t working properly.

Does the thermostat affect the heater?

Thermostat. A faulty thermostat could be behind your car’s heater not working. If it isn’t opening up to let the coolant flow through it, the core can’t produce heat. Thermostats can also get stuck open causing the engine’s temperature to stay low.

Why is my furnace blowing warm air not hot?

Check your thermostat’s settings, because your thermostat could be set to “Cool” which will limit your furnace from blowing hot air. Check that your air filter is clean and you don’t have a clogged air filter. Blocked air ducts can limit return air flow, which can compromise your furnace’s heat exchanger.

What does it mean if your heater is blowing cold air?

Your furnace may be blowing cold air because the filter is too dirty. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. When overheating, your furnace can trip a high limit switch, causing the furnace burners to shut off so that the heat exchanger does not crack.

Why is my furnace blowing cold air when it’s on heat?

Sometimes, a furnace blows cold air due to duct leaks. Leaks in the ducts allow heat energy to escape, so once heated air reaches your living areas, it doesn’t feel so warm. Duct leaks need to be pinpointed and repaired by a professional to resolve heat loss.

How do I know if my thermostat is bad?

7 Signs You Need to Replace Your Thermostat

1. Your HVAC Keeps Turning On or Off.
2. Faulty Thermostat Readings.
3. Suspiciously High Energy Bills.
4. Constant Temperature Shifts.
5. Thermostat Is Too Old.
6. Thermostat Fails to Respond to Changed Settings.
7. Your HVAC System Short Cycles.