My Subaru started overheating; it had run out of coolant completely.
Once I refilled the coolant, the car ran about a 1.2k mile trip just fine without any overheating.
Recently, the car started doing it again.
I have to periodically open the radiator and dump more coolant in every 300 miles or it will begin to overheat.
Unfortunately, the time has come where I have to drive 1k miles.
I have a new car waiting for me at the end of that 1k drive and all I need to do is make this trip.
Any other alternative will be $1000 atleast; replacing the head gasket at a mechanic is $1700.
No mechanic has actually looked at the engine, so I'm just assuming this is a head gasket based on the symptoms and the fact that is has overheated previously.
What's the best course of action?
Is this something that is urgent and needs to be fixed right away?
Can I use Subaru Coolant System Conditioner to seal the leak?
Note: I don't care if I obliterate the engine by getting there. The car is almost scrap at this point having nearly been totaled with repairs.