Hey everyone. I have a 99 Lumina and the darn thing decided to drop about a gallon of coolant on my way home in 90 degree weather. Luckily I got it home. Today is my day to try to fix the darn thing. I'll try to keep it short and sweet but basically the LIM gasket, water pump and the head gasket were replaced last year with felpro gaskets. It has been running great for a year and runs super cool.
Little bit of history: when I replaced the water pump I realized it had been rubbing against its housing. When I spun it you could feel it rubbing against the inside of its housing. The new one was nice and smooth. I have been fighting a very small and intermittent coolant leak in that area ever since. It looks like it's coming from the timing cover housing, almost like it had a super small pinhole or crack that may have been caused by the bad water pump, but it is underneath between the pump and the engine and you just can't see the darn thing no matter how you look at it. Not wanting to tear the darn thing open again (took me 3 weeks) I threw (be merciful) a half a bottle of Stop Leak in it and I hadn't had a leak until now.
Anyone have any sage knowledge you can throw at me on this?