Are you sure coolant isn't leaking? Check the level on the degauss tank. Any water on the floor on the front passengers side? Pull up the mat and check if it is wet. Burning rubber smell means oil leak I'm pretty sure.
2008 Mercury Sable Premier
2014 Ford Focus Electric
1997 Mercury Grand Marquis GS
Moved On: 2000 Sable LS Premium Duratec