Sounds like the thermostat.
SOURCE: 2000 Mazda Protege LX AC starts cold, blows "vapor", then warms
Sure take your buddy with you when you go so he can drive you away while they fix it but you do the talking with your buddy standing by ready to leave. Yes low on freon condensate drain stopped up fan belt loose or needes replaced. This is an old car and the mechanics will likly find many things wrong with it make sure they know that you what them to run it awile after it's fixed so that it in with some gas in the tank so they won't worry about running out. Should get alot of repairs done for less than $200
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SOURCE: When driving, heater blows warm air. When idling, cold air.
It sounds to me like you have a plugged heater core, or one that is beginning to plug. With the engine running, carefully feel the two hoses that lead from the engine into the heater core in the firewall. If one of those hoses is colder than the other one then you heater core needs to be replaced. This involves removing a bunch of stuff under the dash. Sometimes it's pretty easy and sometimes not. Start by removing the glove box and you should be able to see the plastic housing for the heater core.
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