Can i changes the radio

follow your top radiator hose to the engine there should be a metal thing attached with 2 bolts, take them out remove the thermostat either replace the gasket or use high temp silicone to reseal it after you put in the thermostat pointed end up

The problem is electrical and I think the there may be an issue with the PRINDL display creating a short .

if its an after market radio , they at times come with their own fuse, which would be located in line with the Hot 12v supply to the radio itself, If its the original radio that came with the vehicle,, check the fuses with a meter rather than just by sight,, sometimes the fuse looks good but has blown so close to the edges , its hard to tell, since you have 2 things out, I'd check them all

Check this RADIO GUIDE for Mercury Sable radio install...



Hope helps (remember comment and rated this).

It is the theft prevention system that newer vehicles have. When power is disconnected to the radio, it goes into lock mode and you have to enter a code and follow the procedure in your owners manual to get it unlocked. If you do not know the code, then take it to your Ford/Mercury Dealer and they will have it unlocked and provide you a code in less then 5 minutes. Most likely they won't charge you anything for it either.

Good Luck

Look under your car and check each side for a big washer with a rubber mount to the body. It almost sounds like the frame mounts are loose and the drivetrain is separating from the body in reverse.
This could bind the wheels and pinch wires to things like the radio.
Years ago Ford had a problem with rust on the washers allowing the rubber parts to slip through.

I suggest quit hunting for maybes and rent an OBD code reader which ends up being free when you return it to the auto parts store. Connect it and find out what is causing the CEL condition. Normal issues are the O2 sensor, or sensors in the system.

the turn signal problem sounds like the multifunction switch (the turn signal switch) is bad as far as the radio and windows it sounds like the trans range sensor is bad it is located on top of the trans at the shift linkage

If you have checked Power/Ground, and alls good look toward the Multi-Function Sw. (turn sig.sw) this is where everything get distributed at...as for your power loss when shifting, is it column/floor shifter ???? need to know....

Hello and thanks for using FixYa!, the problem with your sable is that the transmission range sensor needs to be replaced, back in 1996 and 1997, the circuitry internal to the sensor caused an interference with several other systems in the car, including the radio, power steering and power windows. Have the sensor replaced and it will need to be adjusted, so it is best done by a ford dealer who would have the proper alignment tool.