CLICKING SOUND WHEN HEATER IS ON, UNLESS RECYCLE MODE IS ON
CLICKING SOUND, OR I SHOULD SAY A SOFT THUMP ABOUT EVERY TWO SECONDS ANY TIME THE HEATER, DEFROST OR AC IS RUNNING, UNLESS THE AIR RECYCLING MODE IN ON. IT ALMOST SOUNDS AS IF A BAFFLE OR CONTROL FLAP OF SOME KIND IS OPENING AND CLOSING.
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Re: CLICKING SOUND WHEN HEATER IS ON, UNLESS RECYCLE MODE...
Sound like a vacumm leak at one of the baffle door controlers. Look at heater box when makeing noise, should be able to see which controler is going in and out. Once you isolate which is the culprit check the hose circuit for that door.
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What A/C problem did you have , original complaint for taking to the dealer ? Does the blower motor blow air out of the vents , when switching from floor to center vent to defrost does air change direction ? What make model an year is your vehicle . Does your vehicle have manual or automatic climate control . Were there any codes stored in the control panel ? Mode door or temperature control problem ? Do you here any clicking behind the dash ?
Clicking sound you hear is the worn brushes in your blower motor. At this point the blower moter may or may not start with the switch. THe blower motor is faulty so I would change that first, then check for vacuum leaks or faulty selector cable for the heat blend door. It could have came off door side or heater control side.
The defrost feature in most later vehicles utilizes the AC to speed the drying of the windshield inside. It is the mfr's choice as to whether to let you know that this is happening. ACs cool by extracting moisture from the air . . . or the inside of your windshield. BTW, in the defrost mode, you can use the heater while the AC is running this warms the air that the AC is drying- it works fine. Using the AC does increase fuel usage so some makers might not want you to know that it is operating while in the defrost mode.
air blows out only defrost possible cause could be faulty ac and heater mode switch or broken vacuum line to ac and heater vacuum actuator.you have to remove ac and heater control switch to check it out.
I doubt if you have a fan problem. More than likely you have a bad actutor motor. There are 2 small electric actuator motors under the dash. The temperture door actuator moves the air temperature door, which controls the temperature of the air coming from either the a/c or heater vents. The mode actuator (which is probably the one you hear clicking) controls the mode of operation, or more simply, which vents the air will be coming out of. When the internal gears of the mode actuator fail and start slipping, they make a loud repetative "clicking" sound, which is what you are hearing. Another symptom that may or may not accompany this situation is a longer than usual wait time for your mode selection to occur. So to sum up, a loud repetative clicking sound from the center of the dashboard possibly accompanied by a longer than usual wait time for your ac,heat or defrost mode to occur, usually indicates a failing mode door actuator.
Lift the hood and watch AC compressor, you will probably see that engaging, and disengaging regularly when defrost is on. ( that is probably your clicking sound your hearing) The AC coming on while in defrost mode, is normal, as it aids in removing moisture, thus defrosts faster. If it appears to happen too often, you may be low on freon, otherwise, you can shut engine off, and remove connector at AC compressor, but be aware, it won't defrost as fast, or as efficiently. If you do remove that connector, I'd advise every once in a while to put it back on for a day or so, to keep the compressor from seizing up. The proper thing would be to have AC system checked first.
I take a shoot here you can try this. try pulling the fuse or fuses that go to your heater blower and heater controls. If it stops check your heater blower it may be going bad, if you find nothing there, leave the blower unplugged and try turning your key on and see if you still hear it. If so I would think that the heater control is mess up and open and close the air blend door or you may have a wire shorted out under the dash some where.
Pull the AC control in the dash and verify that there is vacuum going to it, all the different air diversion doors are operated by seperate vacuum motors controlled by the ac control head in the dash, as you switch it it sends vacuum to the correct location to work that door for the desired air outlet, dash, floor etc..