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What are your going by ? Temperature gauge ? Is the coolant boiling in the engine ? Do the cooling fans run ? did you change the Thermostat , water pump ?
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Vacumn hose to operate flap is damaged or somebody kicked on outside of plastic cowl holding flap in place on floorboard,or cable going to slide mechanism,not funtioning....if flap in open position going to get cold air ,has to shut,to bypass fresh air intake,an let only heated air through.....
I recently had a simular problem...try to follow the heater hoses that come from the engine and go into the firewall to the heater core... one of the 2 hoses connects to a plastic valve right before the firewall. This valve shuts off the flow of hot coolant into the heater core when heat is not needed.. Look carefully at this plastic valve, there is a wire pull cable with a small loop at the end that connects to a lever on the valve. Have a helper work the heat controls and make sure the cable pulls on the lever at the firewall valve...I've seen some cables disconnected. Hope this helps with your diagnosis.
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