Heater is not working.Checked the coolant,thermostat,heater core don't know what else to check.Also checked the fuses. Any ideas why it is blowing out cold air. Just had it in for an oil change,front end alignment mechanic said the hoses coming from the radiator are warm and he flushed out the hoses thinking their might be a blockage.
In many cars there is a flapper valve in the ductwork which is sometimes vacuum actuated.If this flapper is stuck or the vacuum line is unhooked or deteriorated,you will not feel any warm air at the vents.Look under the dash for rubber vacuum lines or try moving the selector knob for HOT/COLD or FEET/VENT/DEFROST while revving engine alittle to increase vacuum.
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Let car cool down then check coolant level. If it is low it won't allow coolant to pass through the heater core. If it is ok it could be stuck thermostat or bad heater core. If lines coming out of heater core are hot on both hoses it is good, if only one is hot then it is a plugged heater core. You can take hoses off and use a water hose to flush out heater core from one hose then back the other way through the other hose. Hope this helps!
First check your fuses .. make sure it is not blown ....Otherwise if fuses are ok ..Your Heater core is probably going ..or gone or you attenuator valve is not opening vents to let heat in ? is the floors/carpets wet ? especially on passenger side front or is the windows foggy wet ? Then you you need a heater core
Do yo know if the heater core is getting Flow. when engine is warmed up. feel heater hoses hoing into and out of heater core. if both are warm then you have a blend door problem. if one is warm and one is cold and coolant is full and no air locks you have a plugges heater core. reverse flushing sometime works. otherwise it would need to be replaced.
Try these; a thermostat stuck open or opening to soon, air in system from a leak (low coolant), but most likely a plugged heater core, also the temperature blend door or its control may not be working.Good luck! Please rate me.
The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case. if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.