What is wrong with my 1999 Ford Contour?

Best thing to do is to trace the wiring. You may have poor turn signal switch contacts and may need a new switch but a wiring inspection of that system is needed before you can say that the switch is actually the problem. Same with the Heater controls. here are some manuals with wiring, I think that Mitchell has the best wiring diagrams. http://bit.ly/mitchell_repair_manuals_online http://bit.ly/alldata_repair_manuals