Originally Posted by cky3k
Thanks so much for the reply, Macster. I have a few follow up questions.
Can you tell me more about what you think this indicates with the A/C system?
I'm not sure what system the shop has used to check for error codes. But I can tell you they missed a code relative to the hvac earlier in the week for a separate issue (fan clicking inside the dash- they said there was no code. Once the hvac started blinking though, they determined the code was only registering when they hit a specific button- i think the recirculate button). None the less, they are telling me there are no other codes at this time. Is there a system that detects codes better than others? I'm a little disappointed that I was told there was no code for the fan making noise, only to find they were able to find it later by pushing different hvac buttons while looking.
When you say: "Something else to consider is just clearing the fault codes. Fault codes can sometimes get set from a low battery or even a battery disconnect or disconnecting the HVAC controller," did you only mean this if there is actually fault codes that we are aware of? Just to be clear, I am told there are no codes. (although it seems definitions of this may vary) I can tell you the battery was disconnected prior to this blinking issue arriving.
My Boxster references are boxed and I have no room to unbox them and store then on book shelves. (They consist of 64lbs of 3-ring binders some inches thick filled with manual pages.)
So I did a google search of a blinking HVAC turned up some posts that this indicates either the system is new and needs to be adapted or is faulty.
Then it occurred to me my Turbo references are accessible (these are in digital format) and I referred to my Turbo reference and in the A/C section (both my Boxster and my Turbo have the same HVAC system and I believe the Turbo reference applies to the Boxster HVAC system) and it specifically states that blinking HVAC display indicates a problem. The number of blinks may mean something specific but I have no info on this.
Regarding following the installation of a new A/C system regulator for instance: The display flashes after the ignition is turned on. In this case the system test must be carried out first. The A/C system regulator hereby leans the upper limit stops of the drive motor and the entire system is checked simultaneously!
As for erasing fault memory, here is some more info with some stuff omitted to avoid too much typing. After trouble-shooting or repairs erase the fault memory with the PST2 and carry out a test drive. After the test drive read out the fault memory with the PST2 again.
Fault code setting conditions: Fault codes can be set in serveral circumstances, e.g.: battery disconnect, plug connection disconnected, power failure, etc. In these circumstances no fault is present in the system and the fault memory must be erased.
For the PST2 it goes on: In order to be able to assess the fault exactly, the fault memory info key (F8) must be pressed. This information should be saved using the Save key (F4) and printed out. If a fault code is stored with 'not present' status and no other problems are present, then the fault memory must be erased.
After completing repair work, read out fault memory, press the info key (F8), switch off the ignition and switch on again. After a short period, the fault memory text goes from 'present' to 'not present', if the fault has actually been remedied.
I should point out my experience, what little I have as an owner of two Porsches with the HVAC system, is with the auto climate version of the HVAC. Both of my cars have this system. This system may be a bit more elelctronically sophisticated than the regular HVAC system (with which I have no experience).
The shop you select to use for this should have the proper equipment and know how to use it to diagnose the problem regardless of which HVAC system you have in your car.
Based on what you have posted I do not think this is the case.