Is there a permanent cure for the thermostat housing? It seems I get about 14 months out of one before it starts leaking. The inlet from the top radiator hose always gets warped at the bolt holes and starts leaking. On the last one I used a little RTV to try and get it to seal but it didn't work. I work hard to maintain my vehicles but this one is worse than my jeeps. TNTech- any good information here?