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Why is my car not blowing hot air on heat?
If your blower only works on the highest setting, your blower motor control module probably needs to be changed. If the fan isn’t working, you probably need to have the blower motor fixed or changed. If the air coming through isn’t hot, the heater core is probably clogged.
What is wrong when your car heater blows cold air?
A car heating system blowing cold air can be due to a faulty thermostat, low coolant fluid level, malfunctioning heater core, a leaking cooling system, or problems with heating controls and blend door.
What to check if heat is not working?
Check your power source—a tripped circuit breaker or blown fuse could be the reason for your furnace failure. Reset your breaker or replace the fuse to see if that restores heat. Check your filter—if it’s so dirty that your system is struggling to move air through it, your furnace could overheat and shut down.
Why is cold air blowing when the heat is on?
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.
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.
What are the symptoms of a bad thermostat?
Leakage from the mounting surface. Appearance: Seepage, drips or large coolant bleed marks on or around the mounting surface or on the housing.
Why isnt my heat working in my house?
If your furnace does not heat at all. 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.
Why is my heat not getting hot in house?
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.
Why does my heat feel like cold air?
There are a few reasons your heat pump could be blowing cold air. Turn off the heat at the thermostat and check your air filter. If it’s dirty, change it! Make sure the thermostat is set to “AUTO”, not “ON”.
How can you tell if your thermostat is open?
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.
Why is cold air coming out of my vents when the heat is on?
Clogged air filters could be causing cold air to blow out of your vents. A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat.
Why is my Chevy Blazer not blowing hot air?
If there is a lack of hot coolant running through the heater core or less common, a pocket of air trapped in your heater core, the vents will not produce hot air. It is crucial that you immediately check the level of the antifreeze in your radiator and fill it until it is full.
Why did my 99 Blazer AC stop working?
99 Blazer – AC stopped working in 2007 so took to a shop a few times and was told the compressor was bad because it would not hold freeon. Another told me I had a leak somewhere. However, once freeon is added it is cold but gone the next day.
Where is the heater located on a Chevy Blazer?
The cabin heater in your vehicle produces heat from a heater core. The heater core is a small radiator, located under the dashboard of the vehicle and consists of conductive aluminium or brass tubing with cooling fins to increase surface area. Hot coolant passing through the heater core gives off heat before returning to the engine cooling circuit.
Why does my car heater stop blowing hot water?
The valve that controls the flow of hot water (coolant) in to the heater core could be stuck closed, or the linkage to it broken/ faulty. not letting the water in to the core. Give me a few and I will locate that valve on your car..and what it looks like so you can take a look on your car. 134 people found this helpful.