It should release like other caps. Try to get it off using a strap wrench. One of mine is tough to remove and comes off fairly easy using the strap wrench.
Thanks. I have read that some of these caps have an anti theft set up on them. If this cap is set up that way, is there something else i need to do? I've tried turning it with a strap wrench, lifting while turning, still not coming off.
Thanks
Check if there is a small Allen bolt head on the backside of the cap. Some caps use that as an anti-theft device, as it's almost invisible unless you know what to look for.
Marshall
Thanks for the help everybody. I finally got the radiator cap off, a little master blaster and some lite tapping on the cap and she came off. She was rusted to the filler neck.