The control is stuck on the heater position, meaning pressing the other buttons (BILEV, windshield, A/C) doesn't switch the air direction. I believe this switch works by compressed air so I may have a leak. What is required to fix this?
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Re: Climate control switch broken
Check all the vaccumn lines that might go to the location of the switch. You can pull them off, depending on where they are at.But be careful to notice where you took them off from. and close one side with your finger and blow through the other side.If any air is leaking you have found your problem. If not , it may be the valve itself.
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Dustin, Sound like vacuum loss to position switch. Defrost is the default position when vacuum is lost in vent control system. Check any and all vacuum lines and connections under hood first, especially any that run through firewall. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info." 2001 F150 V6 4 2 AC Heat Stuck In Defrost Easy Repair
Does your heater fan turn on? If not, could be a fuse, could be fan motor, could be wiring connections. If heater fan works then defroster switch may be the problem, or connections to the switch, or again a fuse. Temperature controls may have some effect. Usually, defrost needs heat to work well. The engine needs to warm up.
. Air won't blow out of the floor or center vents just defrost ? Do you have manual or automatic climate control ? Air Flow Control
Air flow control is accomplished in the following manner:
Primary control is through the function selector knob mounted on the A/C-heater function selector switch, which is part of the integrated control panel.
The function selector knob has the following positions: OFF, MAX A/C, A/C, PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST and DEFROST. The A/C-heater function selector switch combines a vacuum selector valve with an internal electrical switch.
The vacuum selector valve directs source vacuum to various vacuum control motors (18A318). Refer to the Vacuum Control Diagram , System Airflow Schematics and Vacuum Control Chart .
Two internal, single-pole electrical switches are also controlled by the A/C-heater function selector switch. The combination of these electrical switches controls the electrical supply to the A/C clutch and heater blower motor switch (18578).
The position of the function selector knob determines the manner in which the system will operate.
Each position of the function selector knob is detented for positive engagement.
Vacuum Control Motors
The vacuum control motors (18A318):
are located on the A/C evaporator housing, A/C recirculation air duct and heater air plenum chamber (18471).
direct system airflow to the vehicle interior as determined by the remote climate control module or manual override.
The five-passenger seating configuration has an additional vacuum control motor mounted on the heater air plenum chamber to control airflow to the rear seat A/C register (19893).
There is a blender that controls the air flow to go through the heater core for heat, and the evaporator for AC. It very well could be stuck.
You maybe able to try and get it to get unstuck by running the cars AC and switching from heat to AC back and forth and see if it gets unstuck. Just turn it on full blast and go from heat to cool.
If that fails, then you may need to service it. There should be a Lever Marked VENT under the dash, usually by the Brake
and other pedals on the Driver's Side. Close the VENT and that will
stop the Air from coming in and leave the A/C Blowing through the
I also read this online if you have an electronic climate control. "On
climate control press off and heat button and let go quickly. Then
press automatic. The display will start rotating eventually displaying a
code 025,125 , 024 etc. Then press defrost to stop. You may hear blend
door operating atb that time. It worked for my climate control."
If your vehicle is equipped with automatic climate control, this should help.
Recirculation Operation The HVAC control module controls the air intake through the recirculation actuator. The recirculation switch closes the recirculation door in order to circulate the air within the vehicle. The outside air switch opens the recirculation door in order to route outside air into the vehicle. Regardless of the blower motor switch position, recirculation is available only in the panel and bi-level mode switch positions. Including the OFF position. The mode switch must be placed in either the panel or bi-level position before the blower motor switch is placed in the OFF position. In order to reduce windshield fogging, outside air is circulated when the mode switch is in the defrost or defog positions. If the recirculation switch is pressed into the ON position when the mode switch is in an unavailable mode position, then the recirculation switch LED will flash 3 times. If the HVAC control module detects a fault with the recirc door the HVAC control module will try to drive the actuator for a predetermined amount of time, to outside air, which is the defaulted position for the recirculation actuator
Its more then likely the temp door broken or temp door motor broken/stuck. There is 2-3 of these motors under the dash on the side of the evap/heater core box. Some require extensive labor to replace, good luck
I had the same problem. AC computer forgot where the adjustment flaps are. - Start the car. - Press Auto button on the AC (if you have this option) - Increase fan speed (make shure it is not on minimmal setting) - Decrease the temperature setting to the minimum -> "Lo" - Wait about 10-20 seconds - increase the temperature to the maximum -> "Hi" - Wait about 10-20 seconds
- Set the temperature that you like.
With this procedure you force the AC to move the temperature regulating flaps to go to both end-positions and motors get calibrated again.
If this does not help, there must be a bad contact somewhere or the fpals may get stuck. -> repair.
the first thing to d is to go under the hood and see if eh cable is stuck if it is not then it has disconnected from its position secondly yu may have a heater control valve which is broken inside which means the water is still flowing nd the heater is on wheher o choose hot ot cold.
the only way t fix the heater control valve is to repace it