Mine was low on coolant when I bought it. I have never been able to keep coolant in the reserve tank. I have had to top of my coolant only twice in 12000 miles but I have gotten hot cause I was low on coolant and my fans work fine. Maybe his has the same issue.
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2004 Flame Red Dodge SRT-4 - 1 or 2 mods
2007 Bright Silver Metallic Dodge Nitro - Stock