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Bad coolant flow. check for low coolant, also a thermostat could be restricting proper coolant flow. If coolant is full in the radiator than touch your upper radiator hose to see if it is hot. If their is proper coolant level and engine is warmed up to temp and radiator hose is cold replace your thermostat.
OK. Start by warming up the engine, and then shut it off when it is up to operating temperature, and open the hood. Carefully feel the heater hoses to see if they are hot. If you are unsure of which they are, ask someone who knows. They are about 1 inch in diameter and are found at the rear of the engine attached to the firewall. If they are hot, the problem is likely the flap inside the heater inside the car, which is controlled by a vacuum line or a wire cable. Someone will need to dismantle the heater box under the dashboard to see about the air flap. If they are not hot, feel the radiator hoses to see if they are hot. If the radiator hoses are hot, and the heater hoses are not, you will next check the hot water shut off valve which is in front of the firewall, and in between 2 pieces of one of the heater hoses. This valve is controlled by a lever on your dash board, that is marked hot or cold, and may have the colors red and blue on it. Those valves usually fail by "sticking" closed, because lots of people only use the heater a few months of a year. The valve is opened and closed by a wire cable or a vacuum hose. If the valve works freely, you may have a "stuck" thermostat in the engine, which would not make enough heat to warm you. Nowadays, engine thermostats usually stick open when they fail. A symptom would be the radiator hoses and the radiator are warm but not hot.
the only way you should have to replace a heater core is if it leaks or gets plugged up. When motor is hot feel the two hoses that go to the heater core. one should be fairly hot and the other should be the same but if one is just warm then follow hose and locate a flow valve and check for operation. OPening and closing with control hot /cold knob. Check coolant level in radiator while cold as well as fill reservoir to full when cold. Also remove radiator cap when cold and warm truck and check for flow of coolant. if lower radiator hose is hot hot hot and upper hose is cool then thermostat may not be opening properly, or thermostat is stuck open not building heat. You didnt mention if truck was overheating?? If its not i'd check for the flow valve operation, if it is i'd make sure coolant levels are full and waterpump is working.
good day, heater core/coil is leaking antifreeze and needs to be replaced. The heater core works in conjunction with your engine's cooling system. The function of the cooling system is to remove heat from the engine, and it does this for the most part by sending the heated anti-freeze to the radiator located in the front of the car. The position of the radiator allows outside air to blow across the radiator thus cooling the anti-freeze. The anti-freeze is then sent back to the engine. Hot anti-freeze is circulated throughout the cooling system by the radiator and heater hoses. Think of the heater core as a small radiator located inside the dashboard of your vehicle. hope this helps, have a nice day.
on these trucks if you have lost coolant in any way its very common to get air pockets in the rediculiously long heater hoses going in and out of heater core. when toping off coolant remove one of the hoses and make sure coolant flows out while someone fills radiator or resivor bottle if no radiator fill is avaliable.once coolant comes out quickly put hose back on and tighten clamp. Doing this will allow the coolant to flow through the engine and not create air pockets. START with that. its kinda like a bleed effect.
before doing all this a way to check if thats your problem feel the heater hoses. if they are not as hot as upper or lower radiator hoses when engine is normal temp.then they have air in them. all hoses should be somewhat hot to the touch. NOT WARM
Sounds like a heater core. Check the passenger side floor board. Sometimes when these go out there will be some water on the passenger side floor. Hope this helps some.
Okay. warm up vehicle, get radiator hoses hot. Turn on heater, fan on low. Grip both rubber heater hoses close to the firewall, from the engine compartment side. They should be too hot to hold for long. If they are not hot, then you have a lack of coolant circulation to the heater hoses. If they are hot then access heater core, behind glove box area. Blend door which moves as you chose HOT or Cold, should be cable controlled, move the controls and be sure the door is actually moving. Keep me posted
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