Two problems related to rear suspension coil springs have been reported for the 1999 Mercury Sable. The most recently reported issues are listed below.
My 99 Sable GS has a recall on the front coil springs and Ford will not replace them because it has exceeded the time frame. Which is rediculous! I never even recieved a recall notice on the car we found the recall online. Also the rear coil springs are broken and the tires are messed up and Ford won't recall them if salt is going to get in the front coil springs and make them crack then what makes you think that it won't get in the rear? we have small children and are worried about their safety. We will be getting a lawyer and file a complaint through him because this car is not safe for anyone to be in let alone children. I think they should worry about safety and not mass production.
I took my car to the dealer to have a rear suspension squeak diagnosed and repaired. The mechanic discovered that a broken rear coil spring was the cause of the squeak. The part of the spring that rested in the spring seat had fractured several inches from the end of the coil. The mechanic recommended replacing both coil springs to reduce the risk of the unbroken spring fracturing, puncturing the tire and causing an accident. I paid for replacement of both coil springs and had the rear struts replaced at the same time to restore the car's original ride quality.