I have the same question and predicament. After removing the top center portion of firewall I am able to get the left side of the collector out enough so it can be raised out of the way for access to expansion valve. Even after loosening the control box on the right side it won't slide forward enough to free the collector.I want to change my expansion valve on a 02 CLK430. Is there a trick to getting the "water collector" out? I have it loose but it seems like it is shoe-horned in there and I don't want to force it.