Check the auxiliary fans. They can run at two speeds: the lower speed is activated by the high side pressure of the AC, while the second level is activated by a coolant temperature above 105C.
It looks like the fans do not operate at all. You could check fuses and relays (in the relay compartment nest to the fuse box. I think the fans themselves tend to seize as well with age. Then there is a resistor or connected electrical wires that may burn.
Good luck, Bruno

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1992 300TE 160 kmiles