Hey man, Sounds like he did not "Burp" the system, The gurgling sound you hear are air pockets, I'm not sure if thet do the "Burping" Differetly these days but I would run the car till operating temp with the RAD cap off, When the thermostat opens is pulls in coolant the level would drop , I would then top off the rad and close the cap, An make sure the cooalnt tank was at the proper level, Just take it back and have them recheck it.. Sounds like he missed a step.
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14 Q50 AWD, ARK, ECUTEK (SEB), Takda, 
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