Having to replace your stat yet again would suck, but Motorcraft does make a 180 stat for these - RT1225, available from RockAuto for about $23. I'm running one (haven't even had my tune adjusted for it yet, so the fans still don't come on until higher temps) and it works as claimed. Opens at 180, full open at 188.
Burping these things isn't a time thing. It's a number of events thing. If you don't have a vacuum system, you'll need to monitor the level in the bottle for a few weeks. I'd bet money you didn't get every single pocket out.
Burping these things isn't a time thing. It's a number of events thing. If you don't have a vacuum system, you'll need to monitor the level in the bottle for a few weeks. I'd bet money you didn't get every single pocket out.