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The temperature blend door is stuck on the A/C side ! Do you hear a clicking noise behind the dash ? Has an electrical controlled actuator that switches a door inside heater - A/C box from A/C to Heat . So the blower is blowing air over the A/C evaporator core all the time , not switching !
Question. Is the flapping at a very fast pace that would indicate the speed of a fan blade hitting something? If so, you may be on to something there such as a misplaced gasket or something has dropped/fallen into the blower box via a vent.
If it is not that speed then see the following..
Hope I can give you some direction. Speaking from a generic sense all ac/heaters these days have a door or doors in the blower box that control air flow from the main part of the box to different positions when you ask for vent, heater, mix, defrost etc..
Most these days are operated with a small electric servo/motor and unfortunately the mostly have plastic gears that wear and can "thump-thump" as the motor cycles trying to open or close the flapper door.
Try to change the air direction from Max AC to regular ac to heater, defroster, bi-level etc all with the AC switch in the on position if you have a separate on/off switch.
Listen to the sound and see if it comes and goes with a different location of the selector switch.
One last question. Does it happen at idle or driving down the road at any particular speed?
Lets start with that and see what happens. This is interesting.
That noise is the heater and AC air temperature control electric blend door motor trying to move a duct door that is sticking due to heat warping. You will need to remove the entire dash assembly and replace the blend door. This door is located between the AC core and the heater core and "blends" the air from each (hot from heater core and cold from AC core) to give the desired air temperature,.
1st thing you can check is to open the hood and have a helper turn the AC switch on and off and listen for a clicking noise from the engine compartment. If you hear this clicking noise everytime the AC is turned off and on then it is likely the AC compressor is working okay which would likely mean your blend door and actuator is stuck or has malfunctioned somehow. In either case they are both jobs for skilled tech's do to the likelyness of having to remove the IP to change them. If you do not hear any clicking noise under the hood then check all fuses and if they are all okay then I would recommend taking your car to a local tech that is AC certified do to the complexity of an AC system. Hope this helps.
no 200 degrees is plenty hot your thermostat should open at 195 degrees.check hoses to heater core make sure they are both hot if not you have blockage if they are hot then you might have a stuck blend air door.change thermostat as a last resort.
the motor that opens the vent is stuck. Put in it fresh air mode. the vent should be on the pass side behind the glove box. Take off the glove box and disconnect the motor and replcae it. Or the cheap way is to not use that mode
It sounds like the heater box to me. There is a vacume modual that closes the heater box so you can run the ac or just put the controll on cold air.Lay on the floor and you should be able to pinpoint the noise and replace whatever is broke.
Bad heater core. What is happening is when you turn on the air you are getting fumes from the heat of the engine and the heater core leaking causing you to get a smell and also fumes. I would suggest that you take it to the dealership or a mechanic and have the problem fixed ASAP due to the health issue