Hey guys, My Subaru randomly heats up, it can heat up quickly no matter what speed im driving and then be fine for the next week or two. I have taken it to the dealer and they cannot duplicate the problem. I told them it was probably the thermostat sticking etc...but they claim it tests out fine. I think I am gonna replace it this weekend my self as the dealer seems retarded. The second time I brought it in, they called me an hour later saying there was nothing wrong even though you can see that coolant has boiled out of the overflow bottle. I change the oil every 3000 miles and check coolant etc.. and I cannot see any physical damage or leaks in the radiator. Also, there is no evidence of water in the oil or steam coming out of the exhaust from a blown head gasket. Also the car has 30k miles on it and I do not drive
100mph everywhere with the air on. Any advice is appreciated! Thanks