Overheating idle is fine and new thermoshat
Subarus
can be challenging to "burp" Sometimes it takes several attempts to
get the air out of the system. The procedure is simple. Top off the
radiator, squeeze the hose a few times to help get the air out, replace
the cap and start the car. let it idle or drive slowly near home with
the heat on high. once the temp gauge begins to rise, if there is no
heat get the car back to the driveway before the temp gauge gets half
way. Shut the engine off wait for it to cool, at least 10 minutes.
Then check the radiator again. If there is still air top off again and
repeat. After 3 or 4 attempts if there is still air and or the coolant
reservoir seems to be filling, try replacing the radiator cap. If this
doesn't solve the problem, It may be a head gasket.
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