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check radiator fluid level it take hot radiator fluid to pass through the heater core to produce the heat in your car VIA the fan. also check or replace your thermostat it could be bad and stuck in an open position thus radiator fluid not getting hot, no hot fluid no hot air the other problem sounds like a duct hose under you dash has come loose locate and reattach.
check the coolant. then outside under the hood near where the 2 hoses go into the heater core there is a heater coolant control valve. make sure the vac line is connected and not broke. feel the hoses there at the heater core after it warms up. are they hot? if not the valve isnt opening and letting coolant into the core
If the fan is still blowing air through the vents, but the air won't get hot, you probably have one of a few problems. 1. Your coolant level is low. Top it off. 2. Your Thermostat is stuck open. Replace it. 3. You have a leak or clog in your heater core or the lines leading to or from it. Replace them. Good Luck.
You could have a blocked heater core. Check for two heater hoses
running into the firewall in the back of your engine. They should be
together and about 5/8" in diameter. If one is hot and the other is
cooler then your heater core is blocked. Unhook both hoses and use a
garden hose to back flush. Be sure to catch the coolant and dispose of