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If the heat selector control button is working properly and there is no heat, check level of coolant. Low coolant will be a definate cause of low/no heat. If coolant level is good, you need to check blend doors for proper operation on the heater control assembly
With blower on high and tempature to max heat check to see if you have good air flow in all mode selections (defrost, vent, floor etc.). If so and you still have no heat then check heater core hose going from engine to inside car to heater core with vehicle running and coolant tempature about half on guage. If both hoses are hot and coolant in radiator/overflow bottle is full then hot cold blend door is stuck in cold position. If coolant level is low you will get no heat, check coolant level first.
it sounds as if you have two problems,one the heater core is plugged and two you have a heater core that is leaking.the leak is shown when you use the defroster by the smell and chances are there is a light film of antifreeze on the windsheild.and the plugged heater core is shown by no heat.check the radiator to make sure the coolant level is full and the overflow bottle is at the full level. as a low coolant level in the radiator will cause no heat.with the car warmed up(radiator coolant hot), check the heater hoses at the firewall were they enter the heater core they should be the same temperature from one hose to the other.if the coolant level is up and the hoses are the same temperature then the heater core is plugged.if the coolant temperature is the same from hose to hose but not hot to the touch the thermostat may be weak and needs replacing.either way the heater core will need to be replaced as it is leaking into the heater box assembly
With the engine off, radio too, turn the key on and try the heater fan on all speeds. No fan, check the fuses. Fan is ok, check the coolant level, if thats fine, then check for a mouse nest in the duct work. Frankster016