car heater blowing cold air then hot

Start engine and run the heater on full. Youll see it bubble and foam in there as air is purged out.

Reasons Why Your Car Heater Is Blowing Cool Air

Then the blower motor moves air across the heater core fins allowing warm air to blow out of the AC ducts.

. If the actuator is clicking this is another sign it will probably need to be replaced. When the temp goes cold check the heat of the inlet heater hose and compare it to the return hose They should be within 10 deg. If not there is an obstruction with the heater core air pocket.

They can be diagnosed with an advanced scan tool. I only get hot air in my vaxhaul vectra then for a couple of months it was fine i was getting cold air but now its back to just warm air. If the heater still blows cold when there doesnt appear to be a problem with the water level or the thermostat it could be due to a blockage of air in the cooling system.

When it does it messes up the normal operation of the heater. You may have air in your radiator core but this does not go inline with putting air condition coldhot fixing it. Allow the engine to cool and remove the rad cap.

You checked the heater core air bubbles and every possible component and there is no problem. A malfunctioning heater blowing cold air prevents the defroster from removing ice and fog from the windshield creating dangerous driving conditions. The water pump pushes hot coolant through heater hoses to the heater core.

When the engine is fully warmed up put the cap back on and. This should bleed off the air bubble. In some vehicles a valve opens up and allows hot coolant to flow to the heater core when you turn on the heat.

Since the AC compressor is driven by the engine it doesnt pump as much refrigerant when youre at a stop or driving slowly. The heater core that resembles a compact radiator is the high point in a cooling system. May not be heater cont valve.

Check the cooling system for leaks after it is warmed up again. If the pump is responsible then it needs to be changed with a new one. The heater core has a narrow internal passage.

A dirty or clogged heater radiator. 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. Here are the most common reasons why your car heater isnt blowing hot air.

Or if it is automatic climate control the flap motors or some valves may be faulty. Why Isnt the Car Heater Blowing Hot Air. 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.

If the heater control valve is the culprit the air coming into your vehicle wont feel warm. If the temperature gauge dial on the dashboard indicates cold when the engine is in fact hot then the thermostat is faulty. Air is not supposed to get into the cooling system.

If the system is low on refrigerant it will show up as AC blows warm at idle and blows colder when the engine is running at. Continue to add coolant into the top tank until full. If both hoses are same temp then start checking for an issue with the temp blend door.

I will show in this video. Thank you for using FixYa. Fortunately this is an inexpensive spare part that is easy to fit.

Set the heater to its maximum setting remove the coolant tank cap and fill it to the proper level. So its called a blower fan. If the coolant level should drop as the thermostat opens top it up as necessary.

I saw that when I try to change temperature on heater control. WHY MY CAR HEATER DOES NOT BLOW HOT WARM AIR. 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.

A pluggedclogged heater core. The heater core is clogged from debris in the cooling system. The heater core may also leak coolant.

Car heater does not work blowing cold air. HEATER BLOW COLDIn this video we will explain the reasons why your car heater might blow cold air. If your system has a bleed port or bleed screw and you can find it you can fix this air lock yourself.

If no more coolant can be added replace cap and shut down the engine. It is possible that the air mixture flap of the heater core is somehow loose perhaps. Problems with the vehicles heating system can be either no air or only cold air coming out of the heating system.

The following are some issues that may be causing the heater to blow cold air. FAQs qnadmin December 25 2021. Once your fan has come on look around the radiator for a bleed port or bleed screw.

Your cooling system fluid level is low and air is entering the heater core hoses. This valve opens to allow the water to flow into the heater core. The Car Is Very Low on Coolant.

Fill it up with the proper mixture of coolant and water for your area. Check the relay and heater fuses 1st. Ford Heating Fan Heaters Car Air Temperature.

So your car heater blows cold air then hot and you have checked the coolant and there is no problem. A faulty thermostat thermostat that is stuck Broken blower andor blower motor. This passage might be clogged with particles that buildup during the period of usage.

Run the engine until the fan kicks in. Start the engine with cap still open and let the engine idle for a few minutes. Why not blowing hot air.

Usually thats good enough unless you have a stubborn air pocket. Besides the heater core has some fins in the external that can also be clogged due to debris or other particles coming from outside. Another reason for car heater blowing cold air is a clogged heater core.

If your car. Now for some common issues for a car heater blowing cold air. This coolant typically around 200 degrees then delivers the hot air.

If debris has caused a clog in the heater core it will need to be replaced. A fan blows air through the heater core where it gets hot and then into your car. Blend door actuators are the most common reason for the car air conditioning to blow cold air on one side and hot air on the other.

When the heater blows slightly warm instead of cold air a thermostat with stuck open valves is to be blamed for. The fan is not called a heater fan sorry to disappoint you because it blows air into the car for the air conditioner as well. Air trapped in the heater core.

But most often than not you overlook the component which is right in front of your eyes and that is the heater fan. One possible cause is an air lock in the cooling system.

Why Is My Car Heater Blowing Out Cold Air Brr

Car Heater Is Blowing Cold Air 7 Causes How To Fix It