the heater control valve it stuck closed for some reason. Check for a broken vacume line between the heater control to the valve. With the engine running check for a good vacume at the valve with a vacume gauge it should be close to the same reading as the engine vacume. If all is good then the valve is bad GRUNGE BUILD UP ON EVEAPORATOR (CAUSED BY LEAK) AND BLOCKS INCOMING AIR TO HEATER CORE AS IT IS IN FRONT OF IT. YOU WILL HAVE TO PULL THE EVAPORATER TO CHECK. I KNOW OF 2 INSTANCES OF THIS ALREADY INCLUDING ME ; ) GOOD LUCK. There is a seal that sits behind the heater core and fire wall where the hoses connect to the heater core. You can get an air leak there and cool air will be produced by your heating system. To check: with blower running squeeze your hand down by the heater hoses in the engine compartment. If you feel air coming from the blower motor then you will need to seal the leak. you also have a seal that is on the inner cover to the heater box that covers the heater core. That can cause some air leaks also.
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