My 2004 WRX started to overheat today in slow traffic. I pulled over at a gas station and noticed the coolant reservoir was empty. I bought a jug of coolant and waited 15 minutes to open the radiator cap. I dumped about a quart into the radiator and about the same in the reservoir.
After that everything seems fine.
My car has 57000 miles, is stock except for a Borla cat back, has not had a radiator flush, and has never overheated before. I park in a garage and there is not signs of a leak. I have not checked the cooland level in a very long time.
My questions are:
Where did the coolant go?
Is a head gasket covered under the 60K warranty?