How do I get to channel 210? When I turn the knob on the radio (2009 Mercury Mariner) it goes from 194 to 0.

Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
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Anti-theft system problem probably . Is there a security light lit on the instrument cluster ? A car and a padlock symbol ?

This can be caused by a weak or misfiring engine cylinder but the check engine light would be on an most likely flashing, if that isn't the case you may need new engine mounts.

Hello Amanda Garcia,

What I think... you should have been hearing before this is a whirring sound... particularly when you are turning your wheels...
(as in parking). The dryer the hydraulic system the more the sound is like GROWLING... (means the interior is banging metal instead of PUMPING FLUID).

To me this sounds like your hydraulic fluid has not been checked and topped up for a very long time (possibly a leaky seal or hose).

You should look ... better still take your care to a
REAL Service Station and ask for the attendant
(they still exist) to put in some PS fluid.

Done in time... you MIGHT still be able to save your pump.

Check your own parking spot... for OIL puddles (or ponds).

ALTERNATIVELY in the power head itself there are pressure valves that should only respond to you direction from the STEERING WHEEL... if one of those is failing it COULD be provoking the action your are feeling.

Pump
http://www.rockauto.com/en/catalog/mercury,2009,mariner,3.0l+v6,1443450,steering,power+steering+pump,7380?a=Referer+www.ask.com+URL+%2F

Rack & pinion
http://www.rockauto.com/en/catalog/mercury,2009,mariner,3.0l+v6,1443450,steering,rack+and+pinion+complete+unit,7388?a=Referer+www.ask.com+URL+%2F

Could just be blown fuse, or disconnected wire.

sounds like your alt. is starting to go out and possibly a dead cell in the battery check to see if battery and alt. are working

Take it to a certified mechanic. Sometimes there is a frame cross bar that will need to be removed to get access to the transmission cover.

Get your owners manual and look for the fuses that controk those features and then replace them that should fix the problem

change the switch mate .... that should sort it... good luck.

just remove it or you can modified by changing the whole thing with the external switch..