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first make sure the coolant is full. then there are 2 hoses going into the fire wall to the heater core are they both hot? if not the heater core is most likely plugged up. not letting the coolant flow. when was the themostat changed last it might be stuck.good luck. also on some vehicles there is a heater control valve , its located near the fire wall,if its not opening it wont let coolant flow to the heater core.autozone.com has pictures as well as a component locator
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