First water pump was in 2002 with 53,000 mi. Then one in 2004, another in 2007 and another in 2008 - all from NAPA, all leaking out the weep hole, replaced each myself. No telling how long they leaked until belts started slipping from the antifreeze drip. Again I noticed antifreeze at weep hole in Dec 2008 and had a local shop replace the NAPA water pump with a Delco (including bleeding the system). Three days later, the new Delco began leaking out the weep hole! The local shop replaced it in Jan 2009. Last month, just 8 months later, I noticed residue again at the weep hole of the 2nd Delco and the local shop had no solution but refer me to a GM dealer. 151,000 mi now. I've replaced the thermostats several times, have a new radiator which eliminated one of the two original hoses from the original reservoir tank (reservoir tank was also replaced with a new one hose GM unit and GM cap). Today NAPA gave me another water pump, but have no confidence that will work either. Sure could use some advice before I tackle the 7th water pump.