HI DO I HAVE TO WAIT FOR THE AIR SYSTEM TO LEVEL CAR BEFORE WE ENGAGE IN DRIVE ? ON A 1996 LINCOLN MARK VIII

it is located at side of dash drivers side page 109 of your owners manual starts your fuse information the following link is the owners manual incase yours is unavailable
1998 Lincoln Mark VIII Owner Guide 1st Printing

AIR COMPRESSOR TO AIR RIDE IS POWERED DOWN.

oil pressure too low,check oil level,tune up,fuel filter,air filter.

I am trying to find where the heater valve is located on a 1996 Lincoln Mark VIII; I found only one place where it said it was under the dashboard, but I am trying to find more exact information.
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Truck & Heavy Duty Diagnostic tool

On this website (link below) you find fuse box diagram and description for Lincoln Mark VIII (1993 - 1998)

Lincoln Mark VIII 1993 1998 fuse box Auto Genius

new springs need by the sound of it

test battery(amp load test) if ok, replace battery cables

Hi, yes, I have replaced the air-suspension on a personal towncar sedan I owned with coils and I can say the ride was rough, you can use softer tires and a lower psi in tire to make the ride a little bit smoother, noisy because the rear axle was not designed for a coil to rest on it, so the coils "rub" on the axle when traveling over bumps, and the shocks should be replaced with new heavy-duty but soft type. If it's just the driver and a few passengers, this conversion will work, if you don't mind a rougher ride. BUT if your towing anything or have the trunk and passenger area loaded, the rear will sink, but most likely the tires will not touch the wheel well unless your towing a boat or camper or hit a big hole on the road.

sounds like you may just have an air column in the system.Try this,Remove the radiator cap,start the car,turn heat on high,wait for the car to reach normal operating temp,and add coolant as needed.(if you watch inside the radiator,as soon as the car reaches operating temp,the water level will drop,That is the time to add more)

you need to replace your idle air control valve