Corsair issued a product recall notice to customers and retailers to return their Hydro Series H100i RGB Platinum SE all-in-one liquid closed-loop liquid CPU coolers, because the coolers aren't all that "closed loop." Corsair reports that coolers belonging to a particular manufacturing lot show signs of faulty seals of the tubing, which causes the coolant to leak between the tubes and sleeves. "We discovered that less than 1% of Hydro Series H100i RGB PLATINUM SE coolers sold to date are leaking small amounts of coolant into the hose sleeving. These leaks are easy to spot, as the sleeving is white, and coolant is bright green," the notice reads. To spot if your cooler is one from the bad lot, pay attention to its 12-digit serial number. Digits 5 thru 8 denote the manufacturing lot, and if it happens to read "1852," it belongs to the bad lot. Corsair invites customers with these faulty coolers to claim free replacements, including shipping.