W140 Right side heat

[Zoni]

1996 S320 has right side het that doesn't blow hot air unless thermostat is set at max. Is this a thermostat problem in the dash?

Also have air leak around windshield. It's not the original glass. When the weather turned cold I think the sealant shrunk. I was thinking about using silicone sealant once I got the molding off. Any one know how to remove either left or right side molding an the chrome strip at top of windshield.