Defogger Heater problems of the 1996 Mercury Mystique

My heater control knob for high,med,low only work in the low position. My rear brake light had a leak,allowing water to fill up and blow my light bulbs. There is a ticking noise in my dash as if my turn signals is running, but no flash on the indicators. When I signal to take turns it works fine but when not turning still makes clicking noise. Transmission went out in October 2000, I heard this is a common problem in my vehical. . Thank you for your time.