Hi, I’m a new 2.0 caliber owner. I had a 2.4 patriot prior to this. And, I’m not too familiar with the 2.0. I just replaced my radiator and heater core due to over heating. My heater core was full of what looked like wet cement. Not sure what it was. Any ideas? Also, what’s the small line running off my upper radiator hose? Looks like it runs back down under my air filter towards driver seat somewhere. I bought a new upper hose because my old one exploded. I temporarily have it fixed and my car running with the small line capped off. Not sure what it is or if it’s hurting anything at the moment being capped. And how would I take the small line off. Not sure what it’s connected to.