Less resistance might come from a few squirts of your favorite spray penetrant up under the 2 folded under ears that wrap under the neck flange.
Ford coolant cap stuck.
All you have to do is to wait until it is cool down then use your palm to pound on the cap a couple of times to loosen up the sticky cap push down while you are turning it should be coming out easily.
I managed to rotate the remaining part a bit with some pliers but it.
Since it s not turning at all you either need more torque or less resistance.
The first broken part on our ford escape replaced coolant reservoir duration.
I normally wet the o rings with a smear of something when i open one up to prevent what you have.
The cap s two retaining ears are probably corroded stuck to the under rim of the filler neck flange.
Removed the expansion tank cap on lady targ s 2010 fiesta and the cap came apart with half of it stuck in place in the tank.
You want to turn the radiator cap counterclockwise to open it but it is stuck.
Allowing the car to sit for around 30 minutes will ensure the pressure and temperature has dropped to a safe level before you attempt to remove the radiator cap.