Oh oh, vent window...
I had the same problem as you... then i realized my frame was rotten, and the seal was bad.
I replaced the frame and seal with no rusty parts from down south, and it works great (still lets water from a pressure washer in tho DOH....


89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim