To me, it sounds like air in the system. Even if the thermostat is stuck open, the coolant should still be warm-ish. If there is heat when driving and none when you stop, there is not enough coolant to reach the heater core.
My $.02...but either way, take it back and get them to fix it...Let us know what they find.
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mults
40th Anniversary 'Z', 312.06HP/260.58TQ (Dynosty EcuTek Tune)
Build Date/Number: 1/27/2010 #706
Berk HFC + CBE, R2C CAI, Clear Bra, Cleveland Z Club
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