Yes, i agree too. Normally i just install parts from my local auto part store whenever they need to be replaced. But some times i get frustrated and just use original parts or from the dealer to make sure i'm doing it "right". I guess makes me feel better. I believe my heater core is working fine since both in and out hoses get hot. Lets see how everything goes after i change the thermostat maybe tomorrow. I will update with the results. Thanks.