Overheating ’05 impreza rs2.5

[stickboy]

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

 

[bungalow_steve]

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

Just remove it and see what happens, I had the same problem, temp goes
up and down, but everything checks out fine, it was the thermostat...

 

[Roberto Roman]

Just remove it and see what happens, I had the same problem, temp goes
up and down, but everything checks out fine, it was the thermostat...

My 2011 wrx radiator started leaking and engine heated up changed radiator and thermostat would this fix my problem