The first broken part on our ford escape replaced coolant reservoir duration.
Ford coolant cap 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.
Since it s not turning at all you either need more torque or less resistance.
If too much pressure has built up removing the cap can send boiling water and steam up and out in all directions.
I normally wet the o rings with a smear of something when i open one up to prevent what you have.
You want to turn the radiator cap counterclockwise to open it but it is stuck.
The cap s two retaining ears are probably corroded stuck to the under rim of the filler neck flange.
If it s not opened up enough the internal o rings dry up and hardens and coolant crusts up the cap and cause the lip that on the piece that is stuck in the reservoir to let go and all you get is the upper part.
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.
How to determine if your radiator cap is bad p2181 duration.