The last month or so I have not been able to consistantly get heat coming out of any vents in my 04. I noticed probably 2 months ago that I was low on coolant(at that time I believe I got heat with no issues) so I topped it off. Now I am low again and on top of that dont get heat half the time. It will warm up for awhile then go cold. Figured a leak somewhere could be the cause of this. Haven't noticed any puddles of coolant and cannot see upon inspection where itd be leaking from. anyone know of any common leaks that TJs have that maybe arent that noticeable and are rather slow leaks?