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Thermostat stuck open, heater core clogged, or heater control coolant flow valve stuck closed. With the engine at full operating temperature check the hoses at the firewall going to the heater. If one is hot and the other is cold or just barely warm, the heater core is clogged or the coolant flow valve is stuck closed. If neither is hot, you have a thermostat stuck open and need to replace it.
The first thing I would check is the level of antifreeze in the radiator. If it is low, you need to find out why. Hose or water pump leaking, blown head gasket, etc.
If it is not low, possible air mix door malfunction or clogged heater core.
Check your coolant level and make sure its full, next i would look into replacing your thermostat, if your thermostat is stuck open your engine isnt able to reach operating temperature therefore heater output suffers, your coolant temp gauge should read around halfway when the engine is hot if its not look into replacing the thermostat, if your gauge is reading halfway check the cable going to your heater box when you adjust your temperature on your heater controls its possible that the cable broke or the blend door inside the heater box is stuck into the cold position allowing only cold air to come through the vents.
It sounds like you either have bad controls or stuck dampers in your vents. The stuck dampers are usually caused by plant debris getting in to the air system.
If the car is hot and the heater blows cold air your thermostat is stuck shut or your radiator is really low on water/antifreeze check when engine is cold hasn't been ran like overnight take off the radiator cap and if it is low add so antifreeze/water if heater still blows cold air or water level is ok your thermostat is stuck shut and needs to be replaced.
If the temp guage remains cold....the thermostat is stuck open, therefore coolant is running thru the motor always. Therefore, no heat anywhere, and poor gas mileage.
Sounds like a stuck heater core valve. Find heater core valve. Under hood, find the two heater core hoses going into firewall. One of the hoses has a valve. Operate temperature control (full heat, then full cold) check that valve changes position. If not either replace valve or control system failure. Also, when temperature control in cold position, one hose should feel hot and the other cold. Temp fix: disable valve to close no heat or on heat.
It sounds like you have a blend air door stuck. This is in the housing of the heater a/c blower unit under the passenger side of the dash. There is a motor on the top of the housing that could possibly be stuck or on working.
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