I am stumped. Have had my '90 740 wagon for 3 months and she's always taken on water during rain. The water gathers and hangs ten in the front and rear passenger side floor. Sunroof drain isn't clogged. I resealed the plastic cover behind ECU. Yesterday, removed cowl and resealed fan cover which was loose and definitely allowed water to come in via the blower. Rained last night and same [censored] puddle in floor. Where else could water infiltrate?