2002 Volvo S60

Engine Cooling problem
2002 Volvo S60 4 cyl Two Wheel Drive Automatic 129, 00 miles

I replaced my bad thermostat and I am having a slow leak of anti freeze. I replaced the gasket twice and tightened the housing. It does not appear to be leaking from the housing, but that is all that I touched during replacement, any thoughts?
January 23, 2009.

Is it leaking between housing and intake? If yes then housing mate surface maybe warped. Remove and put straight edge on it. If comming around bolts coat threads with No. 2 permetex or similar.

Jan 24, 2009.