New Heater Core Is In, But No Air To Floor

snub

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I had a repair shop install the new heater core for me. Everything went well but now the heat will only come out the defrost vent, no air to floor. The tech knows this but he didn't finish the job until late in the day and I needed the car so I will have to take it back so he can find the problem.
Anyone have any ideas where he should start to look? He figures maybe it's a vacuum line problem. I did notice that the idle increases when I push the 'floor' button.

BTW, my car is a '94.
 
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