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the most common cause of this is your engine coolant may be low. If this is the case then there is not enough of it to pump through your heater core (the coolant is hot from you engine, it is pumped though a serise of tube-like things similar to a radiator and then air is blown across it to make the air hot). That or your heater core itself may be broken in wich case it cost about 100-200 with labor to get a new one.

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Q: 2003 Mitsubishi Galant have no heat and blow cold air?
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