When the system does not have sufficient coolant the car heater doesnt produce sufficient heat and the heater core blows cold air into the car. If you dont get heat it is likely there is still air in the system.
Car Heater Blowing Cold Air Check The Blend Door Actuator
Depending on how low it is your coolant warning light may come on.
. If the fan is blowing cold air then the fuse is fine the water flow valve to the heater matrix cold be frozen or seized or there cold be an airlock in the pipes that feed the matrixSome cars have bleed valves on the matrix flow and retun pipes to allow the air to be removed usually peugeot and citroen. Check your heater core pipes for pressure and make sure both are heating up. Slow Blower Fan Speed.
If its faulty its best to buy a replacement thermostat. Low blower speed can also cause the refrigerant to freeze up in the evaporator. If you bleed the coolant system properly you should now get heat from your heaters.
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. The coolant supply is blocked. Car heater is not blowing cold air Causes.
You should top up the coolant to the appropriate level. Its a common occurrence but why do car. This type of heater is present in most cases.
The thermostat signals the car heater the engine is warm thereby kick-starting the car heating process. You can get a. Car heater does not work blowing cold air.
In this case the check engine light should be on and a P0128 code activated. If the condition of your water pump is not good in that case it may also lead to your heater blow cold air at idling because this part circulates the coolant through the cooling system. Without coolant your heater will only be blowing cold air when the heat is on.
If your car has low coolant it wont be able to reach the heater core and circulate the warm air. Thermostat is stuck. A bad AC control switch that will not make good contacts can also be the reason for the car air conditioner blows cold then warm then cold again.
As you observe that your heater is not working properly due to the insufficient amount of the coolant simply add more coolant up to the desired level. Luckily the coolant level is very easy to check. The most common problem when the heat is not working in your car is actually a low coolant level.
Once this occurs the heater may blow cold air. 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. A wet carpet or condensation on the windows can point to the leak spilling into the car interior.
If the heater has a tap for supplying coolant to the radiator then this is closed or jammed because of rust. Free UK Delivery on Eligible Orders. A Bad Water Pump.
If the thermostat is stuck open the engine temperature will drop below normal especially in cold weather. I saw that when I try to change temperature on heater control. In most car models it does also says coolant in text on the cap of it.
If the problem continues unchecked it can lead to overheating and complete engine failure. It does so by opening or closing its valves when the engines temperature reaches a specific level. As we discussed before coolant is the key to making your heater work.
Otherwise the valves in the thermostat hoses may be stuck open. Issues With The Heater Core. I will show in this video.
The process of troubleshooting car heater blowing cold air problems isnt straightforward and quick because unfortunately a fault in any of these car heating system components thermostat coolant heater core heater control valve blend door actuator heater fan or blower motor resistor etc or any unexpected circumstances water leaks or air in the cooling system etc. Make sure to do this when your engine has cooled down to avoid being burned. Why not blowing hot air.
The thermostat regulates the flow of the coolant in the engine. If it doesnt and cool air continues to blow you should check on your coolant level. With water levels and anti-freeze working correctly but still only cold air blowing from the heater the next part to check is the thermostat.
Sometimes troubleshooting a car heater that is blowing cold air requires taking a look at the thermostat. Locate the coolant reservoir Usually a red green or blue fluid. Whenever you start your engine and let the heater warm it may blow cold air for a minute or two.
When the car is cool lift the hood and check the hoses for blockages. This can happen if the engines coolant reaches a certain temperature without the thermoses opening. With the thermostat stuck the circulation of the coolant can be affected.
If your coolant level is too low there wont be enough hot liquid in the heater core resulting in cold air. Air in the cooling system impedes the circulation of coolant in the system and as a result the heater blows hot air only when driving and cold air at idle. Most heater issues in our experience can be linked back to low coolant levels.
The interior should heat. When the rotor cannot create sufficient flow the heater blows cold air at idling and when the car starts moving the air starts getting. 10 Reasons Why Your Car Might Be Blowing Cold Air Faulty Thermostat.
Ad Wide Selection of Car Parts Available. The thermostat is a valve and if the valve gets stuck it could result in the heater blowing cold air. The first thing to do if youre having issues with your car heater is to check your engine coolant.
The heating system can run into several problems described below resulting in the car heater blowing cold air.
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