The W124 windshield is glued in. A squeak at low temps sounds more like trim not installed correctly than windshield to me, it shouldn't move.

However, carefully inspect the A pillar. I've heard reports that it is not adequately spot welded in some cars, causing noises when it separates. Cure is to clamp and weld.

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!