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Make sure that your coolant level is filled. If it's not, fill it and run it. Also try flushing the heater core to make sure you don't have debris in the core. Use a garden hose for this. Simply disconnect both hoses and put the garden hose to one side and let it flow out of the other until you see clean fluid coming out. Reconnect the hoses and fill. Run it again and see if that helps any. Check that the heater blend door is actually moving from hot to cold also. It may be stuck in the cold position casing your problem. Hope this helps. Good luck.
Replace the thermostat and if that doesn't work have the heater core purged of its air while engine is at normal driving temps. Have this done professionally or wear really good gloves do that you don't get burned.
you might have a problem with your heater core ,also check your radiator and make sure it is full if you are low on water that will also cause cold air to blow or your actuator witch is a control switch that opens the vale to let hot water pass through giving you hot air good luck
try flushing out your heater core. sometimes it gets a scale build up and restrickes the flow thru it. what i do is remove both heater hoses to heater core and mix up some water and baking soda and pour it in the heater core and let it set for about a half hour then flush. you might also want to blow the antifreeze out of core be fore you do this as so you get enought of the solution in it. just make sure you flush it out both ways. use a garden hose for this. it makes a mess. but it could be a cheap fix. good luck.