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The engine in your 1999 Mercury Grand Marquis should be running when you perform a transmission fluid level check, otherwise it will be inaccurate. The video above shows where the transmission fluid dipstick is located in your Grand Marquis and how to check the transmission fluid level. If the transmission fluid level in your Grand Marquis is low, you need to add transmission fluid through the dipstick tube. When adding transmission fluid to your Grand Marquis, be sure to add it slowly as it will fill up quickly and is difficult to remove excess fluid if you overfill.
If you are having problems with the transmission in your Grand Marquis, such as clunky shifting or hesitation, check the fluid level first - it is amazing how many drivers pay thousands of dollars for transmission work when a half quart of transmission fluid would have fixed the problem.
If your battery has green or white cruddy deposits, it is probably not getting enough juice from and will likely wear out sooner1999 Mercury Grand Marquis LS 4.6L V8
If your car is leaking a small amount of power steering fluid - see this video on how to fix the leak1999 Mercury Grand Marquis LS 4.6L V8
Power steering fluid is easy to check and many people (mechanics included) often forget about - learn how here1999 Mercury Grand Marquis LS 4.6L V8
Stop! Checking your brake fluid from time to time is a great way to ensure safe stopping1999 Mercury Grand Marquis LS 4.6L V8
If your blinker doesn't blink, or blinks rapidly, you likely have a burnt out bulb1999 Mercury Grand Marquis LS 4.6L V8
White light when you back up - yup, they burn out and you can replace them with bright LEDs1999 Mercury Grand Marquis LS 4.6L V8