car heater blowing cold air then hot

Driving with a low coolant level can cause overheating. Posted by greggordon04 on Jan 30 2012.

Why Is My Car Heater Blowing Cold Air How Does A Car Heater Work

You may have air in your radiator core but this does not go inline with putting air condition coldhot fixing it.

. 10 Reasons Why Your Car Might Be Blowing Cold Air Faulty Thermostat. Whenever evacuating or recharging the AC system if care is not taken the contaminated air can enter the system. Warm water is always in the heater core but most vehicles use a system called a blend door to send air through the core or bypass it.

A car heater blowing cold air as soon as you start the engine is perfectly normal because the coolant hasnt reached optimal temperature yet. Air trapped in the heater core. Air is not supposed to get into the cooling system.

When it does it messes up the normal operation of the heater. The heater core that resembles a compact radiator is the high point in a cooling system. It is possible that the air mixture flap of the heater core is somehow loose perhaps.

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. If the pump is responsible then it needs to be changed with a new one. HEATER BLOWS COLD WHEN DRIVING THE CAR HOT WHEN IDLESIf you car heater starts blowing cool or cold air when you drive you car on the highway in cold weather.

This is the most common reason why the engine runs without heat blowing through your vents especially during colder months. Overheating heater is blowing cold air then hot car over heating. It does so by opening or closing its valves when the engines temperature reaches a specific level.

If the air coming through isnt hot the heater core is probably clogged. 7 Reasons why the heater is blowing cold air in the car. This part is responsible for the circulation of coolant through the cooling system and when the rotor is not able to create sufficient flow the heater blows cold air when the car is idling and when the car is moving it may be slightly warmer.

When the heater blows slightly warm instead of cold air a thermostat with stuck open valves is to be blamed for. The heating system can run into several problems described below resulting in the car heater blowing cold air. The coolant is the component that flows through the engine cast radiator and.

If your car heater is blowing cold air it could indicate that theres a problem with your cooling system heater core heating valves or blower fan. Your car is more than likely low on coolant. Its typically located underneath the dashboard and if its leaking coolant may escape into the cabin.

The following are some issues that may be causing the heater to blow cold air. Clicking this will make more experts see the question and we will remind you when it gets answered. Share this page.

Well cover what can cause your cars AC to only blow hot or cold on one side what other symptoms you might hear and how to diagnose the blend door. Other than that there are 6 primary reasons why your car is only blowing cold air when the heat is on. Its a common occurrence but why.

Car Heater Blowing Cold Air. Why is my car blowing out cold air when the heat is on. If the engine is hot but the air coming into the cabin is cool then its likely the heater core has expired.

As the engine gets warmer the thermostat opens up and lets the coolant circulate through the radiator and later through the heater core which finally heats up the passenger cabin. If the air flow is hot regardless of the temperature knob set then likely the problem is an issue with the blend door actuator. Up to 8 cash back If the heater is blowing cold air and the car is overheating it is likely that the problem is related to the engine cooling system as well.

Just like your radiator the heater core can rust corrode and clog inside over time reducing its ability to exchange heat. Usually air conditioning starts cool and then goes warm in most cases due to moisture freezing up in the evaporator. If they feel cold to the touch after engine has warmed up then you arent getting circulating water to the heater core.

Or if it is automatic climate control the flap motors or some valves may be faulty. If they feel nice and warm then the heater core is fine but your climate control valve has closed off the fan that blows across the core. As we discussed before coolant is the key to making your heater work.

The solution would be to add some more coolant into your cars radiator system. On cold days when you have to travel by car the first thing on your mind might be turning your heater on full blast to cozy up. Without coolant your heater will only be blowing cold air when the heat is on.

Low Coolant Level. Faulty Heater Core. Or the heater core could just be clogged with debris on the outside.

A dirty or clogged heater radiator. A pluggedclogged heater core. A faulty thermostat thermostat that is stuck Broken blower andor blower motor.

If the car AC blows cold air on one side and hot on the other there are a few different causes but its likely the blend door actuator also known as the temperature blend door actuator or vent mode door actuator. Contaminated coolant and low coolant levels in the vehicle are also among the most common reasons why your car heater blowing cold air and not getting hot enough. Heater blowing cold air 8 Answers.

Fog or a sweet smell inside your car may point to a worn-out heater core. If the heater core goes bad itll need to be replaced. The thermostat regulates the flow of the coolant in the engine.

You might get surprised to know that the most common reason the car air conditioner blows cold then warm is MOISTURE.

Is Your Car Heater Is Only Blowing Cold Air Protect My Car