Your post particularily interests me.
First some general info: Throttle plate cleaning and air induction service seems to be needed about every 18,000 miles, in my experience.
You can check your Power Steering fluid yourself and decide. Pull the dipstick out and wipe it on something white. If it's clear, you're okay, if it's discolored (brownish usually but translucent), then get it flushed.
I am really curious to know about the EVAP Flush. I have never heard of it. Maybe there is something new that I'm not familiar with, but would be surprised as we are usually close to the cutting edge. Plese get more info about this, as I am at a loss.
While any competent shop should be able to service this, a Cadillac dealer will have the most direct experience.
It is not necessary to flush the power steering system in a car. However, you should check the power steering fluid level in the car each month.
Checking power steering fluid level Checking belts and hoses Checking the system for leaks Pressure testing the system Bleeding the system
Most carts use steering shaft, spindle, tie rods, and pitman arm steering system. This is the simplest and most inexpensive system. http://www.bmikarts.com/Steering-Wheels-Components_c_274.html
Hard power steering means there is little to no fluid left in the system. The power steering system should be flushed and checked for leaks.
why do we need a steering system
You will need to have the codes checked for your steering system but most of the time the problem is a bad steering position sensor which is located at the bottom of the steering column on the inside of the car. I have seen defective YAW Rate sensors cause this problem but very very rare.
An integral power-steering system is otherwise known as a four-wheel steering system. It is also known as an all-wheel steering system.
It is a system that Granville T. Woods invented.
go and hve the power steering system flushed
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I believe its located where your induction system is. look by the radiator, then go upward and it should be the closesr one to you on the right side.