Dean's working on the Impala with singleminded focus; in the meantime, Sam's working on whatever he can find.
(It's a hell of a lot better than thinking about all the things that are wrong which he can't do anything about.)
Right now, he's still trying to crack their dad's cell phone.
When he does, however, he finds
something unexpected.
"John, it's Ellen. Again."
Sam stares at the phone for a long while before he goes outside to find Dean.
"...It's what I came out here to tell you, okay?" Sam holds the cell phone out. "It's Dad's. Took me a while, but I cracked his voicemail code."
Dean gives him a look, but takes the phone and listens to the message. As he does, his expression changes, and Sam nods.
"That message is four months old."
"Dad saved that chick's message for four months?"
Sam nods again. "Yeah."
"Okay, so who's Ellen? Any mention of her in Dad's journal?"
"No, but--" He holds up a scrap of paper. "I ran a trace on her phone number and I got an address."
Dean snaps the phone shut and hands it back to Sam.
"Ask Bobby if we can use one of his cars."