*** Updated symptoms/observations ***

Hello experts! I'm new to this forum, and I'm glad I found this specialized section, (versus the main general section). This is my first post :-), though I wish it was under better circumstances. I've searched thoroughly for answers to my issue but was unsuccessful , and so here it is:

2011 Cayenne TT - 112,000 miles

While driving home during in a downpour,

• The AC intermittently shut off and on, seconds at a time, which progressed to minutes at a time and then hours at a time, but no cool/cold air.
• I eventually found the loose blower actuator connector was responsible for the intermittent blower behavior. Fixed, but still no cool/cold air.
• I have the Xtool diagnosis tool. I’m not fully versed in it, but was able to feel around it a bit and pulled the following DTC's:
  • 8032 Right Front Footwell fan outlet sensor short circuit/open circuit with B+
  • 8452 Communication with LIN bus (air conditioner 1)
  • Actuation test: LIN controlled motor verification run
    • Results: All test were successful except for the following failures:
      • Successful programming status: Right extended ventilation area (Fail)
      • Successful programming status: Right extended ventilation element, left (Fail)
• Actions I’ve taken:
  • Checked the evaporator drain, and it was bone dry. No water or moisture inside the cab whatsoever.
  • Bunch of fuse and relay checks/tests. Not all relays though. I'd rather narrow down to the relevant ones before diving into adding factors. Some relays under the driver dash are a PITA to reach. I felt one of them that was pretty hot to the touch as I barely reached with the tip of my finger. I have a single .pdf workshop manual file that I just purchased online. It's been seriously cumbersome to find stuff in a 12000 page document.
  • Tested the sensor near the cabin air filter. Resistance was rising in the fridge, and dropping when moved to room temperature
  • Checked and cleared both body drain holes in the front. There were leaves mostly blocking the drain holes on both sides, but more on the driver side. I can feel the presence of a harness wrap on the passenger side when sticking my finger through the drain hole. Wondering if water pooled in that area for a while, and caused wire corrosion/damage, but I’d like to know first what that harness is for, and if it's relevant, so I can proceed with continuity tests at the extremities of that harness. I’m suspecting there is a corroded wire somewhere, but not sure how to narrow it down to a specific harness and pinout, while minimizing tearing into an otherwise mint condition vehicle
  • I also don't know if the DTC's are outdated from the time the blower was in either on or off mode for minutes/hours at a time. For that reason, I cleared the DTC's - hoping that was not stupid of me.
  • And just now noticed there is a hum in the center console (like that of a tiny fan) that stays on for a few minutes after shutdown - if that is relevant. Not consistent, though
  • I ran the car in place with AC Max for 30 minutes. Still no new DTCs. I never thought I'd want to see DTC's, but I do, because it's blowing ambient air in hot/humid Florida and would like to resolve this issue.

P.S. In the same moment during the same downpour, the AC on my 2011 Panamera 4 also blew hot. Both vehicles had perfectly ice cold AC just minutes before and during the beginning of the downpour. No I wasn't driving them simultaneously :-). Jumped out of the CTT into the Panamera and discovered the issue. - unreal. I'm convinced both failures are related to the heavy rain - unless it's a triple coincidence. Different DTCs for the Panamera though (C12094 - Check the fault memory content of the front-end electronic control unit, and C1208A - Check the fault memory content of PASM control unit). And yes I expect to find leaves in the drains when I get to it, but trying to fix one vehicle at a time.

Any help or guidance would be much appreciated. I'm new to these cars but I'm also a fast learner with intermediate experience working on older Porsches. Not fully up on all the acronyms and terminology, so hopefully I won't sound stupid/slow if I occasionally ask about the location of a certain control unit or when the obvious escapes me.
Thanks in advance

 

Update: found the connector to the blower actuator was loose. Seating it back in place resolved the intermittent blower issue. I will update the initial post.
Still no cool/cold air though.
Hoping someone with experience/insight can chime in

Thank you