Bubbles in cooling system overheating. I replaced thermostat, radiator, radiator cap, and hoses. Block tested for head gasket and passed, pressure tested and passed.
What makes this problem better or worse?
Worse when hot engine on acceleration
How long has your 2007 Subaru Impreza had this problem?
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SUBARU - Mysterious engine overheating and the usual fixes don’t work :::
Remove cylinder heads and have them MAGNAFLUXED before installing new upgrade head gaskets.
Good luck!
I’ve had some experience with these vehicles - exact same symptoms and exact same problem every time. Yes - including combustion leak testing..