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Why do I have heat coming out of AC vents when AC is turned on???
I did a diagnostic on the climate control head and got a code 024 which means the blend door actuator is bad I replaced the part and all was working great. I did another diagnostic on the climate control to see if there were and codes NO CODES then I put on the AC and got hot air what happened.. Thankyou Bill W.
The compressor is running the AC lines are cold and I just replaced the blend door actuator and I'm still getting hot air when I turn on the AC..The compressor is running the AC lines are cold and I just replaced the blend door actuator and I'm still getting hot air when I turn on the AC..
I would check to see if the blend door was actually working. I plug them in and check before installing them. If you can see it working in the plenum, Then the plenum door needs replaced. If it isn't working, it could be wiring or the controller. I just tore apart a controller the other day. Bad connection on a plug inside it. I could command the door to work with my computer, but it wouldn't work from the controller.I would check to see if the blend door was actually working. I plug them in and check before installing them. If you can see it working in the plenum, Then the plenum door needs replaced. If it isn't working, it could be wiring or the controller. I just tore apart a controller the other day. Bad connection on a plug inside it. I could command the door to work with my computer, but it wouldn't work from the controller.
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I am not aware of any obd codes that show up for what you are describing as a 024. The blend door actuator replacement is documented: http://www.markviii.org/LOD2/blend_door_repair.htm
and I would have to say that it is either bad or installed wrong.
You apparently have a problem with the vacuum doors in the heater/ac unit under the dash. When one of these vac motors fails (won't open and close various flaps), the unit will default to either a defrost setting or floor heat setting. Fixing these is not a do-it yourself job as usually the entire dash has to be pulled to get to the failed parts. Sorry
BTW P024 is exhaust camshaft position timing and 051 is an oxygen sensor error....neither have anything to do with the heater.
it sure could be that head unit. if you want to clean the unit it might help. disconnect the battery, pop the bezel off the radio and head unit remove the four 9/32" bolts that hold the unit in the dash, unplug the head unit and spray it with computer duster.
The actuator door that is behind the dash that closes off the heater core from shooting hot air thru the vents might be your problem. When you turn on your ac the actuator shuts the door to prevent the air from flowing thru the heater core into the cabin, this may be your problem if everything else is working properly. Let us know.
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
outlets(Vents).
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."
Might be the same....You may want to do the diagnosis proceedure. Alot of times its the door actuators. Servos in replace of old cable design. Usually it will be a code 46. DOOR BLEND ACTUATOR SHORT TO BATTERY. The DTC's can be checked with the MTC control and the Odometer
Display of the Mechanical Instrument Cluster if a DRBIII® scan tool is
not available. The MTC control can only be placed into the diagnostic
mode while the engine is running and the vehicle is not moving. To place
the system into it's diagnostic mode, adjust the MTC control to the
following settings:
The engine must be running with vehicle not moving.
The fan speed set to any speed except OFF.
The temperature control knob in full cold (full counterclockwise position).
The mode control knob must be placed in Defrost position (full clockwise position).
The A/C button can be On or Off.
Press
and hold the rear window defogger (EBL) button until the mechanical
instrument cluster odometer display indicates an "AC00". The BCM will
chime once and the MTC A/C button LED will begin blinking.
Release
the EBL button and wait until the MTC A/C button LED stops blinking.
This means that the error check and climate control door calibration is
complete. NOTE:It is important that no
other control knob or button is pushed until all DTC's are read. Pushing
any button except the A/C button or turning a control knob will end the
diagnostic test without showing the rest of the DTC's. There also may
be other DTC's stored in the BCM not related to the climate control
system. These DTC's can only be found using the DRBIII® scan tool. DTC's
related to the MTC control head will appear on the odometer display in
numerical form after the letters "AC". The odometer display will return
to normal operation if no DTC's are found. If a problem is found, then
the odometer will display the letters "A/C" followed by the DTC number.
The odometer display can only show one DTC at a time. Under certain
circumstances, more than one DTC could be in the memory. To scroll
through any additional DTC's, press the A/C button on the MTC control.
The BCM will beep each time the A/C button is pushed. Continue pushing
the A/C button and recording the DTC's until the odometer returns to
normal operation (note the letters AC will dissapear.
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