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Wouldn't the thermostat be fully open before 100c anyway? As such you won't need it to be pressurized to see it's full range of movement and where it gets stuck.
Edit: looking online, rb30 thermostats open at 76.5. I can't find what temp they are fully open. Highest I've seen on my gauge is 84, which was towing a trailer up a long hill on a 43c day, at which point the clutch fan kicked in and brought it back down. It normally sits between 78-80 unless she's copping a flogging, then she goes to 82c.
Last edited by Throbbinhood; 30th June 2016 at 04:40 PM.