So i'm on offer up. This guy is selling a 05 liberty. For 1000. Said he'd take 800. So i'm like wow sounds good. He tells me it has 195k miles. I'm like oh idk but it's a jeep. Then he tells me the check engine light comes on sometimes. And sometimes it's off. He said he got a diagnostic check which told him that it had a bad thermostat. He then said he doesn't know why because this is his everyday car and it never overheats. He said it drives normal and everything. Any help would be appreciated. Like should I still buy it