Mitsubishi Repair: O/D, mitsubishi galant, d light

Question
I  was driving my car at night and then a small light on the dash board lit up telling me that the O/D is off, what is an O/D?(a mitsubishi galant '94, also have a problem with the fan belt it keeps on slipping and making a squeaking noise)

Answer
Edel,
The O/D light indicates your OverDrive setting.  It's a function of your transmission to allow your car to travel at highway speeds, but maintaining lower RPMs.  It's usually controlled by a button located on your gear shifter.  Look for that button and push it.  See if that turns your O/D light off.  If pushing that overdrive switch does not turn off the light, you should take your car in to get it looked at.  This would also be a good time to get that squeaky belt replaced as well.
Good luck!