Originally Posted by ragtoplvr
If stop leak is so bad why do all GM cars get it from the factory? Or at lease used to a few years ago. Heck the older caddies used to get a double dose.
"cadillac tabs" are brown pellets sold by GM dealers and are sometimes used to solve seepage problems in cooling systems. I doubt they'd solve a corroded heater core, but for the $3/tab it can't hurt much to try 'em.