1999 Forester - coolant doesn't fully empty back into radiator when car is cold. What's going on? Is it the head gasket?
Please bear with me, as I don't know that much about cars.
I have a 1999 Forester. As I understand it, when the car is hot, coolant should empty from the
radiator into the reservoir (big plastic bottle that you can fill), and when the car is cold, this
coolant should go back into the radiator.
I noticed recently that only some of the coolant is going back into the radiator when the car is
cold, leaving the plastic reservoir filled far past the "full" level.
What is going on here? Is it the head gasket, or could it be something else? The head gasket
was redone in 2012, and I was told that it shouldn't need to be done again for the life of the
car (I took that with a grain of salt).
I'm about to take a cross country road trip. My mechanic told me that it could be the head
gasket, and that I should bring a turkey baster to move back the coolant by hand when the car
is cold. How worried should I be considering I'm about to drive 6,000+ miles?
Thank you in advance.