car heater blowing cold air then hot

Your cooling system fluid level is low and air is entering the heater core hoses. A clogged heater core can prevent hot air from blowing without causing other problems Another possibility is that a door or diverter.

5 Reasons Your Car Heater Is Blowing Cold Air Trick Trucks

When I started her back up she was blowing cold airnot good when its 30 deg.

. 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. Youll see it bubble and foam in there as air is purged out. 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 temperature gauge dial on the dashboard indicates cold when the engine is in fact hot then the thermostat is faulty. This should bleed off the air bubble. I moved the vent selector nob around to the front vents and it started blowing hot air again.

May not be heater cont valve. Start engine and run the heater on full. 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.

Fortunately this is an inexpensive spare part that is easy to fit. 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 cycles from hot to cold.

Besides the heater core has some fins in the external that can also be clogged due to debris or other particles coming from outside. If no more coolant can be added replace cap and shut down the engine. 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.

Park the car on a leveled surface and engage the e-brake. Ford Heating Fan Heaters Car Hot Air. You can try cleaning the radiator and check if a crack has not been created where the liquid can come out or air can enter.

Set the heater to its maximum setting remove the coolant tank cap and fill it to the proper level. The heater core that resembles a compact radiator is the high point in a cooling system. Thank you for using FixYa.

The coolant supply is blocked If the heater has a tap for supplying coolant to the radiator. Air trapped in the heater core. The coolant is the component that flows through the engine cast radiator and heater core and blows hot air into the cabin.

If the coolant level should drop as the thermostat opens top it up as necessary. A pluggedclogged heater core. 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.

This passage might be clogged with particles that buildup during the period of usage. If not there is an obstruction with the heater core air pocket. When the engine is fully warmed up.

Jump to Latest Follow 1 - 17 of 17 Posts. This problem is usually in cars that have an idling stop feature. Continue to add coolant into the top tank until full.

Heres how you can do that. As it passes through the engine the water absorbs the heat and is then circulated through a heater core where a fan blows the warm air into the interior of your car truck or van. The radiator thermostat belts water pump and hoses are responsible for circulating water to the engine to keep it from overheating.

Check the relay and heater fuses 1st. The heaters radiator clogs over time making it harder for the coolant to pass through its bearings leading to slightly warm air or completely cold air blown at idle. Check the cooling system for leaks after it is warmed up again.

Air is not supposed to get into the cooling system. Or if it is automatic climate control the flap motors or some valves may be faulty. I drove it around town with the heat on and then went into a storeonly for a minute.

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. If both hoses are same temp then start checking for an issue with the temp blend door. Allow the engine to cool and remove the rad cap.

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. Why does my car heater go hot and cold. A fan blows air through the heater core where it gets hot and then into your car.

Make sure the car is not hot. Start the engine with cap still open and let the engine idle for a few minutes. Another reason for car heater blowing cold air is a clogged heater core.

If the engine is hot but the air coming into the cabin is cool then its likely the heater core has expired. You may have air in your radiator core but this does not go inline with putting air condition coldhot fixing it. 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.

When the heater blows slightly warm instead of cold air a thermostat with stuck open valves is to be blamed for. The following are some issues that may be causing the heater to blow cold air. When it does it messes up the normal operation of the heater.

It is possible that the air mixture flap of the heater core is somehow loose perhaps. A faulty thermostat thermostat that is stuck Broken blower andor blower motor. Fill it up with the proper mixture of coolant and water for your area.

Since the AC compressor is driven by the engine it doesnt pump as much refrigerant when youre at a stop or driving slowly. When my car is idling the heater blows cold air. Problems with the vehicles heating system can be either no air or only cold air coming out of the heating system.

It is made up of 50 antifreeze and 50 water. Car Heater Repair Faulty Thermostat Valve. So its called a blower fan.

The heater core has a narrow internal passage. 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. KL Posted on Nov 10 2010.

Usually thats good enough unless you have a stubborn air pocket. Fog or a sweet smell inside your car may point to a worn-out heater core. Now for some common issues for a car heater blowing cold air.

Fog or a sweet smell inside your car may point to a worn-out heater core. 1168 Answers Hello Vicaugus. If the cabin air filter on your car is in good shape and you are still stuck with a car heater not working and blowing cold air the next thing you need to check is the thermostat valve.

Its typically located underneath the dashboard and if.

Here S Why Your Car Heater Is Only Blowing Cold Air Protect My Car