What a horror story. In the trade we call it a radiator cap kit. Remove the radiator and slide a new car under it. I'm really surprised that anyone so inept at diagnosing would be able to assemble all that and have it run at all.
I guess that should be the standard for a good tech: the ability to get the car running after replacing every part on it.
How does he deal with the complicated models?
Bosch Master, ASE Master, L1
33 years MB technician