nine9six

X50tyoe, any chance you can describe the cleaning process and products used to clean your CCU. My upper button functions intermitently as well...
TIA,
Paul

BobbyT

Jason,

You can get the compressor buttons here:

http://www.shapeways.com/shops/Porsche-bits

I ordered a couple, and they are quite good, though perhaps not as smooth-surfaced as the original.

x50type

nine9six

The cleaning process is simple enough; WD40 or your contact cleaner of choice, tweezers and q-tips.

The CCU facia is held in place as show in No. 1 photo, the tabs are at the top and bottom of the CCU. The ribbon cable needs disconnecting - green arrow.

The dis-assembly of the switch [No. 2 photo] requires careful attention. The switch is held in the housing by tabs on the sides, easing these open will allow the innards to be very carefully pulled out. Note where each piece is located, because you are going to have to reassemble it just like that. - you can see from the pix there are a number of very tiny parts which, if lost will render the switch useless and you will have no AC.

Clean all, re-assemble, fit in facia plate, connect facia and put back in to CCU.

It's not a difficult job, I may have made it sound harder than it is.

993c4ie

Hi all,
Cabin temperature has been erratic in my 1995 993C4, so i took the CCU out to give it a clean.

I measured the resistance of the 2 sliders controls. Resistance goes from 0 ohm (one extreme position) to 2.3kohms (the opposite extreme position), and goes up to 3.3kohms in around the middle position..
I got similar readings for the 2 sliders as well as for the turn pot (temperature and fan speed control).

Are these pot not supposed to be linear?

techman1

Not sure about the pots, but are you sure the fan for the air sensor is working properly? I was getting erratic cabin temps. I put a piece of paper over the sensor, and it fell down. Which told me the fan was not drawing air in over the sensor. After cleaning the fan and sensor, all has been normal for a couple of months.

Enso

i bought new switches for mine through Sunset

BobbyT

Hi Glenn,

Would you please post the part numbers for the switches you bought from Sunset?

Thanks

Enso

Hey Bobby
this is the one i got from Sunset
Also through Pelican


Air Conditioning Switch (Recirculation/Defrost, Only for Control Assy w/ Replaceable Switches), 944 (2/85-89), 944 Turbo (1986-89), 924S/944S (1987-88), 944S2 (1989-91), 968 (1992-95) [More Info] [view in catalog]


944-653-921-00-OEM
$167.25

let me know

x50type

The only switch I can see that is 944-653-921-00 is a slider **** at $24.50.

Last time I checked with my local Porsche dealer the only CCU parts available from Porsche was the 2 slider ***** and the 2 rotary *****.

The push buttons and switches are NLA; hence the push buttons now available from Safeways - thanks to 3D printing and a forum member.

Enso

if you call Sunset and ask for this switch they will order it for you
i got one from them like a lot of other guys did

part_number=94465392100
best of luck

x50type

Enso

Appreciate the info -- part # 944 653 921 00 @ $196.85 is, according to my local Porsche dealer, the recirc and defroster switch for the CCU.
FYI part # 944 653 922 00 $107.38 is the single a/c switch [with a single snowflake logo] for CCU's prior to the 993. Don't know if it will work ok on the 993 CCU.

Are you using part # 944 653 921 00 in place of the CCU a/c double switch? If so does it work as the original with 2 speeds.

jo-hans

I highly recommend this product!

Enso

yes this is the same switch and part number as 944
double check with them
is this the switch you are looking for?
best

x50type

so.......Are you using part # 944 653 921 00 in place of the CCU a/c double switch? If so does it work as the original with 2 speeds?

Enso

here is the one i replaced on my 964 on the right
i believe its the same part number at the 933 and
94465392100