Many window tints have a metallic coating & that will limit the AM reception OF all cars that use the rear window for the AM antenna.
The W210 & later cars require special window sealant when installing the rear glass(broken) & it must be heated. IF any other glass sealant is used the AM reception is cut by 50% to 75%.
Have the people that tinted the window use a non-metallic tint on the rear glass.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)