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possible heater control unit failure as this system has a hot/cold blend door actuator and a separate defrost floor blend door actuator so default setting is defrost for that actuator but not hot setting so controller fault is most likely
Check for vacuum leaks. Common problem is the line that comes from the engine into the cabin of the car. It gets hard and brittle and cracks, then no vacuum to power the vent actuator pods.
If the defrost is on when you turn the climate control on this is normal.Even if the temp.setting is to hot.The clutch will cycle on and off.Hope this helps.Good luck.
There may be a problem in the climate control head. The most common problem with HVAC systems of that error is a broken vacuum line. Usually the feed line to the control panel is broken or disconnected from the engine and it is stuck in defrost mode as it's the default mode. If your stuck in the vent mode there may be a broken line at the climate control panel, a broken line to an actuator or a bad actuator.
Check your vacuum pump located on the right side fenderwell. see if its running. Check the vacuum hose at the hubs for leaks or damage. repair if damaged. check for other vacuum leaks such as the grey hose going to the heater control valve.
It could be either..but most likely electrical.....the door motor may be bad or the head unti( a/c heat panel) could be bad or have a bad switch in it.
On cars with automatic climate control: To enter diagnostic
mode, set the temperature to 75F, press the the off button. Press
Floor, Defrost\Floor, Front Defrost simutaneously for 3 seconds until
the temperature display begins to flash. On cars without automatic climate control, set the blower to
any speed, turn the temperature control in between warm and cold. Press
Floor, Defrost\Floor, and Front Defrost. All codes will flash via the
Front Defrost button.
When the test is over all fault codes will be displayed (on cars
without automatic climate control, they will be blinked out on the
Front Defrost button).
Code Action
23 Blend door feedback control
24 ATC mode door feedback failure
25 Ambient temperture sensor failure
26 ATC in-car sensor
27 Sun sensor failure
31 ATC recirculate door stall failure
32 ATC blend door failure
33 ATC mode door stall failure
34 Engine temperture sense failure
35 Evap temperature sense failure
36 ATC head command failure
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