intermitent hardness in steering wheel

Hi, i have a strange problem while turning left of right the steering become hard and soft all the time. I have a doubt about the power steering pump ou the rack and pinion but i'm not sure with one to change first. I any of you know how a test or procedure determinate the origin of the problem?

 

Rack & Pinion internal leak.

https://www.tacomaworld.com/threads/bad-leak-in-rack-and-pinion.167307

 

Is it full of fluid?

Miles?

Tom is likely correct, but other details help with internet diagnosis.

 

There is a u-joint at the box where the steering column connects. Spray the living shit out of it with a penetrating oil then spray the shit out of it with lithium grease. Been there, done that.

 

i have no leak sorry yes forgot to tell got 370000km steve 104 got a good point i will start with penetrating oil on the colomn joint.

 

the fluid is full yess poer steering no noise

 

lower steering cv joint was the problem, thx guy!!