Heater and air condioning switch keeps making clicking noise

In the attached drawing, Part 32 moves Part 26 to direct the air flow to the desired locations. It uses vacuum to operate. The actuator may be bad or the vacuum hose my have come loose when the heater core was changed. With the car running but the blower off stick your head up under the dash on the passenger side and see if you hear a hissing sound. If so it's probably just a vacuum hose come off.
AIR CONDITIONING AND HEATER UNIT BODY Fits DYNASTY LASER LEBARON NEW...

Buy one for what car? It's either a stuck air recycle door, blend door or mode door or a bad door actuator. Next time you need help list the year make model.

These lights for the dash are controlled by a rheostat instrument control dimmer switch next to the main light switch for the headlights, it is either turned off (have seen this dozens of times) or it is defective. Below is a picture of the switch assembly I speak of. The thumb wheel next to the knob is the dimmer control.

Try changing the thermostat. Usually, when this happens the thermostat is stuck shut. You will want to do this soon, as your car will eventually start to overheat. If the problem persists, replace the heater core, as it may be plugged.

Please let me know if you need further assistance.

carsandcomps,

Guru, Premium Expert @ Fixya.com

Sometimes leaves or debris collect inside the blower motor case Also if the vehicle has alot of miles and the noise changes tones when changing blower motor speeds the motor may be failing or in need of lubrication. First i would check and clean the blower motor case of debris or leaves. This requires removing nthe blower motor and looking in the housing. Good Luck and I Hope this was very helpful.

I’m happy to help further over the phone at https://www.6ya.com/expert/gregory_8e6ba270263743ac

If this noise is a clicking sound and is coming from the front center of the dash, then it may be the blender door motor which will require removal of the dash to replace it. It will keep the door from switching from heat to a/c. Does the odor smell like you have a freon leak in your a/c evaporator core or does it smell like a rat stuck in your heater and a/c ducts?

sounds like heater control valve situated under scullle panel common fault on ka set heater fan switch half way between hot and cold with heater blowing then touch valve if pulsing or clicking noise it is faulty if doesnt solve problem faulty switch

Your air temp control blend door actuator is failing, that is the part u call a heater door, it is a gear driven miniature drive, the gears are jumping teeth making the noise, it will stop working very soon.

You need to replace the temp actuator.

Check the following fuses:
10 amp GAUGE under the dash, and the 40 amp HEATER under the hood.
If both fuses are good, I suspect that you may either have a bad fan switch or a bad heater fan motor. The switches are rare to fail, I would suspect the heater motor first. Please try this: Turn the key on; turn the fan switch to high. Look under & behind the glovebox, for the bottom of the heater fan motor. Round thing with 3 screws holding it to the heater box. Using a small hammer, or something that you can tap with, tap on the bottom of the heater fan motor. You just may jar the motor enough to make it run. If it comes back on, you may need to replace it at some point in the near future. Worked for me quite a few times. Try that, repost to me what happens. Hope this helps.