AC and aux fan, probably. I think they are similar to the W115 chassis, so electric window relay will be on the passenger side firewall. Could be wrong, but I know the AC and aux fan relays are in there.

the glow plug relay is on the other side of the firewall, I think, under the air intake grille.

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!