Hopefully I'll know this week..leaked pretty quickly this morning(5:30) while going to Rodz Grille where I have coffee every morning.Turned my flashlight on and the fluid was dripping over the hump onto the passenger side rubber mat.Besides anti-freeze and heater core ..do I also need new o-rings and clips for the heater core and box?Saw that about the o-rings on older posts on other forums.How many of these have you changed?...Dave.