I had same problem with my housing when I replaced the thermo. I noticed that there is not much room for error when putting item back together. The metal bracket has to be tight on the left side or you will leak constantly. The design is sub-par with those three screws, just make sure they are all in straight and that bracket is on tight or it will leak like a Sunofabitch.
03' SVT Focus w/YRF0
AEM CAI, FC 65mm TB, FS UDP, SCT by FS, Kent Cam Gear, MBRP, SD and Firewire, FC STS, All VF Mounts, CFM Silicone Couplers, Gear Balance Delete, NE ORP, EBC Green Stuff, FS Front - Rear Stress Bars, KW Springs