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Q: I have a 2005 mercury montego. Why doesn't my heater blow hot? on 2005 Mercury Montego

Just yesterday I replaced the water pump and thermostat.
The heat still blows cold. Now when I turn on the defrost I feel warm air as long as the vegicle is moving. But at an idle both defrost and heat blow cold.
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This sounds more like the issue. A few months back I was hearing a clicking noise behind the glove box and thought it may have been some sort of vac leak to that door.
If thats the case whats the fix for it?
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replace mode door,but fords have an issue with there heater box doors breaking best have it ck'd by a mech to be sure
I checked the core with an air hose while I has it all apart, filled the coolant and bled the system. Still blowing cold
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