Should both hoses heater core hot?

If both heater hoses are hot then the core is getting hot coolant flowing through it. You should check the temperature blend door actuator behind the glove box on heater case to see if it is operating the temperature blend door or not.

The three possibilities are stuck open thermostat, stuck closed heater hose valve (if there is one) or plugged core.

• Fog Inside Your Car. Two things could be going on if you have fog inside your car. …
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• Cold Cabin/Hot Engine.

What happens when a radiator is not circulating, the top hose is hot, and the bottom hose is cold? – Quora. That’s the way it should be when the coolant is circulating. The hot coolant enters by the top hose, is cooled by the radiator and then cooled coolant re-enters the cooling system from the bottom hose.

Check the temperature of the heater inlet and outlet hoses by feel. (The air temperature around the hoses must be at least 85°F (24 °C).

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Clogged Heater Core If the heater core becomes clogged up, coolant cannot flow around the heating matrix, radiator and engine, and can therefore not be used to heat the cabin. If you suspect the heater core to be clogged, a flush of the system will be necessary to restore it to working order.

By reversing the hoses, the coolant will flow in reverse direction through the core, but it’ll still be flowing in the same direction as far as the engine is concerned. … This may not prevent it from carrying debris from the core into the engine cooling system.

A: Most heater cores are designed to have very long use-lifes, averaging about 10-15 years. Obviously, if you put strain on your heater core or fail to remedy a fault when it occurs, such as the heat not working as well as it once did, that life will be considerably shortened.

You basically take the two hoses off the heater core, you stick them together and you’re done. That way, the coolant will continue to circulate, even though it no longer goes through the heater core. And bypassing the heater core should have no effect at all on the performance of the engine, Charles.

The main thing to worry about is after the engine reaches normal operating temperature that both the upper and lower radiator hoses are of the same or nearly the same temperature. If not either you have a bad thermostat, restricted radiator or an air bubble in the cooling system. Good luck and hope this helps.

The engine needs to be really hot and almost overheat before the thermostat lets the coolant pass by. If your car is not overheating, but the lower coolant hose is cold when you feel it – it may just mean that it is not hot enough, and therefore there is nothing wrong with your engine.

Also, touch the lower radiator hose, after the engine has reached operating temperature. If the lower hose is hot to the touch, coolant is circulating. If the lower hose is not hot, it’s possible the radiator is restricted.

Your thermostat may be stuck, which can prevent the heater system from warming up sufficiently. If your heater is blowing lukewarm air rather than cold air, this may be the culprit. Air bubbles may be trapped inside of the cooling system, which can cause malfunction. This air must be flushed out by a professional.

While the engine is warm after a drive, squeeze the radiator hoses, paying particular attention to areas where the hose bends. A radiator hose in good condition should feel firm, but not hard. … A soft hose or a hose with a soft spot should be replaced.

The heater hose is a key component of your engine’s cooling system. … A cracked heater hose can result in leaking coolant. A lack of coolant can cause your engine to overheat. An overheating engine can end in catastrophe.

Heater hoses are smaller hoses that are attached to the heater core, which is located under the dashboard, to supply warmth to passengers in the cabin.

The inlet hose for your heating system is the hose that goes to the water pump area. The other hose is the outlet. These flush kits will actually work on either one though as it does go through the entire cooling system.

Most Common Causes of Car Heater Malfunction The heater switching system might be faulty. The cabin air filter might be choked, restricting the airflow through the heater core. The thermostat valve might not be working right. The heater core might be clogged.

A heater can stop working for a number of reasons, including: A low antifreeze/water level in the radiator due to a leak in the cooling system. A bad thermostat that isn’t allowing the engine to properly warm up. A blower fan that isn’t working properly.

If the heater control valve is the culprit, the air coming into your vehicle won’t feel warm. The heater core may also leak coolant. The heater core is clogged from debris in the cooling system. If debris has caused a clog in the heater core, it will need to be replaced.

The core will heat up no matter which direction. However, some heater control valves are directional, usually they have an arrow on them to indicate direction, and will function better if installed correctly.

If your car’s heater doesn’t seem to be working too well, it might be time to flush it out. Flushing out the tubes in the heater core will allow the coolant to flow more easily so there will always be warm coolant to heat up the air going into the cabin.

Air gets into the system when the coolant is low for one reason or another. Having your heater only work when the car is moving is a big indicator of this issue. You can purchase a coolant system test kit that will tell you if there is air in the system. A common cause for this issue is simply a bad radiator cap.

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.

Fixing a leaking heater core will always be much easier than replacing one. Since it is only a small leak in the heater core, we recommend simply sealing that leak and leaving your heater core in place. You can do this by simply by adding BlueDevil Pour-N-Go to your vehicle’s radiator when your vehicle is cold.

If you have a bad heater core, you should bring your car in for repairs right away. Driving with a faulty heater core can be risky, as it can lead to overheating and extensive engine damage. Even a clogged heater core can prevent proper coolant circulation, causing your engine to run hot.

Are hot radiators unsafe? There’s radiators that get hot enough to adequately heat the room and then there’s radiators that are too hot to touch and pumping out far too much heat. If your radiators are too hot to the touch then this is of concern, especially if you have young children.

The top should be to hot to touch and the bottom should be cooler. You are checking for cold spots that will be cold to the touch. If you find cold spots, you need a new radiator. The best way to check for coolant flow is to remove a heater hose, then start the car.

• Overheating. A dead or dying water pump cannot circulate coolant through your vehicle’s engine and, as such, the engine will overheat. …
• Coolant Leaks. Coolant leaks from the water pump are common and a clear sign that it’s time to replace the pump. …
• Corroded Water Pump. …
• Whining Noises.