The problem "coincidently" happened after a scheduled service, when the radiator coolant got changed. As soon as I took the car home, I noticed the temperature gauge ( usually sits constantly at 1/3 mark) had noticeably climbed to the 1/2 mark. This has never happened before since I bought the car new.I took the car back to the garage the next day.
The Mechanic informs me they flush the radiator before adding fresh Subaru coolant. The coolant level remained constant, ie the radiator is not leaking. The electric fan cuts in and out at the correct temperature(based on what the mechanic said). I asked whether there was an air lock? They said NO. They have even replaced a temperature 'sensor', fearing it was causing the 'un-usually high temperature' reading. But, the problem persists. On short trips, the temperature is pretty normal. However, on longer trips, the temperature goes up one notch. I even checked the radiator grill, thinking something may be lodged causing a bad air flow. The only think to suspect is the radiator thermostat. That has never been replaced before. Do you think that could be the culprit? Because the major service is only 2,000km away. Should I replace the thermostat now or wait until the major service is due?
Thanks in advance
Wednesday, November 9th, 2011 AT 8:29 AM