The climate control keeps coming on by itself. When I turn it off, the climate control characters turn into dashes. Eventually the whole dash, except the speedometer, turns into dashes. I get the following codes on the CCU, PC11353, PZ2255. I called a tech at the local dealer, he said that it sounded like the "Mode Door". Does that sound right? If so how do I change/fix it? If not what might it be?
Testimonial: "This helps, but I need more info:In my book it has instructions for replacing the "Climate Control Assmebly". Is this what you are referring to? The book says that it is incorporated into the Instrument Cluster. Am I looking at the right thing? Do I need to replace the whole Instrument Cluster?"
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This usually means the ac refridgerant is low. In Econ mode the ac compressor will not turn on, your car is staying in Econ to avoid damage to the compressor. If you are low on refrigerant it means you have a leak. Don't just buy a can and refil, have a professional shop check for leaks and fill the system with the proper oil and add refrigerant to the proper pressure.
if it switches function even only a few then the problem is not the vacuum source (if u had no vacuum it would default to defrost mode) the problem is the dash control head vacuum mode control switch, i don't think u can just replace the switch, u have to buy the whole climate control module.
make sure you cheak the fuses they should be under the dash by your feet(i have a 1993 deville and the fusebox is by the E-Break) if any look burned either replace them with the EXACT same model (the wrong fuse might cause a fire) if you're not sure have someone else do it
"MAX" ONLY puts the climate control in the RECIRC mode. Door modes change to " RECIRCULATE" interior cabin air back to be RE-COOLED, instead of using HOT OUTSIDE air to cool. If the problem is in the panel, complete replacement is required. Hope this helps
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).
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
The noise is most likely coming from a sticky temperature control blend door, ( they warp from heat, not an un-common issue) it is moved with a electric actuator. This is very expensive to fix, requiresremoval of the dash to repair, if the system works ok then if it was me I would "live with it".