Hood release is probably a red plastic handle on the lower dash panel, it is on the W124 chassis.

The tab in the grille will pop out an inch or so when you pull the handle.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!