RZR-S Specific Discussion Air lock? July 9, 2015 Put the engine back in yesterday…seems the thermostat isn’t opening? Ran it to 105c and didn’t circulate ….thermostat didn’t open could that be an airlock on that side of the cooling system? What do I do here? Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related