That would be your LOW engine coolant light
You can view the 1999 Mercury Mystique owners manual online at :
www . motorcraft service . com ( no spaces )
Click on Owner Guides
right side of engine,is a big plastic bottle,do not open when hot!
There is no sign on the bottle to indicate so.
The bottle should indicate it on some part of it...
In order to separate mercury from another substance you must have a Mercury separator or a Mercury filter, these are available for purchase by many dealers you can find online.
Clear is better, receives more light. Test indicate that plants not only grow faster, but better in a green bottle.
Any vaccum lines or the intake manifold it is 2 peices, I would look in to the vac lines. !warning! this is Dangerous to find on your own but you can take a (SMALL SPRAY BOTTLE) and gently AND slowly spray around the Vaccum lines till the engine Idle changes when it does there is the leak.
drink a bottle of vodka and sing like Freddie mercury
Auxiliary
Exxon. XXX used on a bottle to indicate that the contents are poisonous.
322 pesos for 30 capsules-1 bottle in mercury drug store. as of AUGUST 2012
Take off the washer fluid bottle.
your out of windshield wiper fluid