the attached photo is a mono-valve - if it is double wide etc then it is duo valve. You need to make sure the insert's rubber diaphragm is intact . Simply and carefully remove the four (or six) screws that hold the top of the valve in place. If in doubt , replace.
If intact you need to make sure the pistons are able to move and not frozen.
the way to do that is to hit the connector male pins (on top of the valve) with direct 12v. If you hear it ( them) click, they are good.
Now you look at the female pins of the connector. check them with a volt meter. KOEO. you should get 12v+ across the pins with the dials set to total blue - when you change the dial towards the red the meter fluctuates finally coming back to where we started with the dial wheels back in the blue. All this can be done before you rip apart the center console and get into expensive labor costs.
If these tests are all good you need better people than me to help you out -
On some models there are all sorts of vacuum actuators. Any failure there could create may-ham in the system.

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