Hey guys, so I bought a 04' Subaru Outback w/ the 2.5L (92k on her) for my wife last week. Had paper work showing that timing belt, water pump, head gaskets (plus all related items), thermostat and radiator cap were placed within the last few months. I test drove it and it ran like a charm, no overheating or anything. I drive it home an hour, no overheating or anything. It sat for a few days till I could get new tags on it and the first time out, it overheated after merging onto a freeway, few min. passed by and she cooled down (when I say a few min., I mean a few min.) thought that was odd but what the hey. So I started her back up and went to merge back over and she overheated again. Pulled over and same thing, except the radiator cap and upper portion of the radiator were cool to the touch. Oh and there was no "hot" engine smell. I get to my destination and drove it back home and didn't overheat at all. I burped the system that night thinking it was an air pocket from when they did the work, lots of air came out. Next day, I drove it to work and I merged onto the highway and same thing. Except this time the reservoir overfilled and blew the cap off so I lost a ton of coolant. After work I drove her home without any overheating issue at all. I then proceeded to look around the heads and saw nothing, no weeping or anything, I did a block test and it came back negative (I did it three times to make sure), there's no smoke or residue in the exhaust, no coolant in the oil and vise versa. Yesterday I changed out the thermostat and the cap to a Subaru OEM thermostat and cap (there was an actual difference between the parts installed and the parts from Subaru), drove her and merged onto the highway and she did not overheat. BUT she almost overflowed the reservoir and by this morning, she did not return any of the coolant to the radiator. So I figured, everything else has been changed why not change the radiator and coolant hoses. So I did that and took her for a drive and no overheating, she did go past the full mark on the reservoir but I don't know if she's pulled any in yet (only been 20 or so min). But I smelled the reservoir and it had a slight fuel smell to it. SO recap. No white smoke No coolant residue in exhaust No visible sign of head gasket weeping/leaking No oil in coolant and vise versa No exhaust gases in coolant Fuel smell in reservoir All new cooling system. Everyone on the Subaru sites are saying headgasket, but it seems like with every overheating issue they say "Headgasket!" so idk. Any ideas guys/gals?