Hey guys, I'm trying to fix a leak in my cabin that seems to be originating from the heater core valve I replaced last year. My suspicion was that the hex screws came loose, but that didn't fix the problem. My second intuition was that the o-rings were split, but when I took it apart, they were merely flat, but were intact. I have the plastic scan-tech one though, and the 6 screws that hold the cooling system inlet/outlet ports to the valve itself were loose, and so I think this is the problem. However, I really don't want to take the whole thing apart and drain the coolant just for this again, so I'm wondering if I can replace both the o-rings (between the valve and the heater core) with a silicone RTV gasket maker designed for cooling systems? Any thoughts on this?