I replaced the thermostat today. It helped a lot. The highest the temp reached was 105 C . I am still looking into what could be the culprit of this problem. My car usually ran at 90 C on a hot day with the AC on high.
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
Monochromatic Paint (Custom Blue)
Flat Badged (front)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS