Hey guys I have a Impreza 2008 (non-turbo with 112k miles on it) and it has been getting colder where I live (from 50 degrees to 20 degrees). Well since it has gotten colder I have been hearing a high pitch whine from my engine when i do a cold start. The noise only lasts about as long as it takes for my blue thermostat gauge to turn off. Once it is off the noise goes away.
I thought the noise was coming from my belts so when i checked all the belts look fine, and they were replaced a year ago. Also the noise seems to be coming from the passenger side of the engine. Only thing I see over there is the power steering reservoir. So could it be that, that is making the noise? I mean the reservoir of it is full but could the pump be going bad?