Sounds like the blower motor has seized up - time to replace it.
See "Related Questions" below for replacement procedures
what clicking noise in the dash of 1997 mercury marquis
Temperature control in dash by heater core is broke.
if its the clicking I'm thinking of its the actuator for the vent door. try shutting off everything off in the heater/a/c system for a couple of minutes and then turn it back on. that usually stops it for me.
The clicking noise you are hearing could be the heater is overloading the breaker and it is on the verge of tripping This could be caused by the heater being to large for the circuit. Check the amperage rating on the heater and the rating on the breaker It also cold be the circuit breaker is going bad and needs to be replaced by a qualified electrician These are 2 possible answers you also could have a bad (loose) electrical connection some where in the circuit
you may have leaves in the fan
If it is a single click, from time to time, it is the thermostat cycling on and off, and it is normal.
Needs a new starter
there is a actuator that moves the tempature blend door,the door that controls hot to cold.the gears in the motor are plastic.is it makes a clicking noise after you turn the heater on ,it broke answer a flapping sound is usually caused by a leaf or other matter falling down thru vents pull fan cover off and clean debis out, mostdoors are are controlled by cable or vacuum,not gears.as you didnt say a clicking sound i doubt very much it has anything to do with motor or gears
rear air unit has a air blending door solenoid, and is probably out. or broken making a clicking noise
low on freon compressor kicking in and out
Change the blower fan speeds to see if the noise changes. It is possible that the fan is still running while the heat is off, and the fan is rubbing.
Believe it or not we cant hear that clicking noise on the roof, a description will help you get an answer...