Please bear with me, I am typing up for my husband.
I own a 2002 Outback. It is overheating. We have replaced hoses, thermostat, water pump, the temp sensor, had the radiator tested. Nothing has changed our problem. My husband is at a loss and the mechanic who has is now has no clue as to what else it could be. The mechanic is referring to it as a ghost problem.
The mechanic is wrong. A small head gasket leak puts tiny bubbles into the cooling system which eventually causes the overheating. It can be hard to detect by any test.
Agree; this car is subject to head gasket problems. The mechanic should do as suggested; if he still can’t find the leak, go to another and better mechanic.
You did not mention whether the cooling fan was operating properly. Have that checked as well.
We have noticed this spring when driving over the mountain passes the temperature would climb and sometimes would go back down. When we were driving around town it would do fine. But then as time would go it would spike and then go down. So this was a gradually thing till it was a definite problem.
When it fist started my husband changed the thermostat. It seemed to have helped until I got stranded one day because it overheated and died. I didn’t know it was overheating because the temp gauge stayed normal. Husband then changed the temp sensor. It now reads the correct temp, which is it gradually goes to the red when idling.
.
It does it with the AC off.
So this moment we are only seeing it overheat at idle. Have not taken it on a road test since it has been overheating by just idling.
I don’t know much about labor costs in Colorado, but I think that you should anticipate anywhere from $1,500-$1,800 for this repair. Remember that there are two head gaskets.
If the cylinder heads need to be machined, it could cost a bit more.
If you have a partially plugged radiator, the fix is much cheaper. You indicated that all this had been checked, but a failed water pump or plugged radiator will definitely cause overheating. The fact that in normal driving it does not overheat makes me suspect the radiator and/or water pump.
Since it was overheating while climbing mountain passes and not in town I might suspect a clogged radiator or partially clogged catalytic converters; assuming radiator fans are operating as they should.
If it only overheats at an idle now then I might suspect a cooling fan issue.
How did your husband test the fans? If he just put power to them and they ran, he has to confirm that they come on by themselves when it is idling. Also did you check that the radiator was full when cold?