Are the same things happening since the work was completed? With the engine cold, remove the radiator cap (not the overflow) and see if the coolant level is full. If it is, perform the bleed procedure below and let me know if that takes care of the issue. If it is not low, let me know if the original issues are still occurring.
See pics below.
Images (Click to enlarge)
Thursday, November 24th, 2022 AT 8:22 PM