No it is completely possible to replace the t-stat by just moving the belt off the left cam "facing car" sprocket enough to unbolt the thermostat housing and replace the t-stat. I have done this twice successfully.
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2003 A8L Build Thread
D3 Turbine Reps – S8 Mani
2002 Allroad Build Thread
2005 Color Match - TDI 01E - TTV LWFW - RS4 PP - BW K04s - Stg 2 WMI - WB- AWE DTS - EFK - H-SPORTS - IPP Arms - S6 Alcantaras - 4K LB Hitch - V1
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