Coolant system not under pressure
Hey what happens when a coolant system is not under pressure? I have one of those radiator caps with that safety air pressure release tab on the top of it.. every now and then I'll pop my hood and see it flipped up..
I wasn't loosing any coolant out of it, just air pressure I'm guessing.. what would cause that to flip up and what could happen if the system isn't pressurized?
1986 Jeep CJ7 (
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Remanufactured 258, ARB lockers front & rear, 4.10 Yukon gears, 35x12.5" Super Swamper SSR's, Motorcraft 2100, 4.5" Rubicon Express Extreme-Duty lift, York 210 OBA, Big Daddy steering, Tatton rear CV driveshaft, Herculined interior, TJ flares, lots of body & upholstery work