Dguth

Yes, I believe that's correct. Could have been my imagination but with the car just idling in the garage, sounded much louder like they were on high blast.

griffiths

Does your model have:
1) A fan in front of each set of condenser/radiators?
2) A resistor pack for each fan, with a set of relays, which provides 2 fan speeds to the fans?
3) At what engine or coolant temperature do the fans first come on at slow speed?
4) At what engine or coolant temperature do the fans kick up to fast speed?
5) Do the fans come on when the engine is cold and the AC is turned on, AC pressure or temperature
does not affect the operation of the fans, simply the AC circuit turned on?
6) Subsequent to the refrigerant blow out near the TEV and pressure switch area,
do you fans come on when the engine is running and the AC button switch is turned on?

Dguth

Guys, one more dumb question. If I want to run the car and ensure the AC compressor doesn't come on, which button or setting should I push? While driving the car until I can get this fixed, I don't want the AC compressor to come on knowing it spit most of its coolant out. Do I hit the eco button and ensure auto is turned off?

o7silverturbo

I had the same exact issue..... https://rennlist.com/forums/997-turb...oblem-fix.html

To be sure pull off the connector and see if there is oil inside the plug.

also the fans could be running on high if the high pressure switch is damaged from leaking causing the computer to thing the pressure in the system is too high and is trying to cool off the condenser when it shouldnt be

2K7TTMIA

Yes, press the ECO button and that should just run the fan, the AC compressor shouldn't be engaging.

2K7TTMIA

07silver, yep. sounds like that's what OP was experiencing.

griffiths

unplug the compressor clutch wire at the compressor

Dguth

Do you have a picture or direct me where that is?

pfbz

I revamped my entire AC system last year and compiled a list of the o-ring part numbers and sizes that might come in handy if it was an o-ring failure on your system (likey?)

This was on a 996 turbo, but I believe the AC systems are virtually identical between the 996 and 997 models.

The XS1, XS2, S, L, and XL designations were just my own groupings for the five different sizes of o-rings used. I had a tough time sourcing some of these sizes even from specialty suppliers and ended up buying them from Porsche. Stupid expensive for an o-ring (I recall a few being $8 plus for a single o-ring) but I guess $100 in o-rings is still cheap in the overall cost of Porsche ownership...

O-rings for the entire AC system loop, starting and ending at the compressor
Compressor -> Hose = S, 999 707 250 40 (10.6X2)
Hose -> Condenser = S, 999 707 250 40 (10.6X2)
Condenser -> Hose = S, 999 707 250 40 (10.6X2)
Hose -> Condenser = S, 999 707 250 40 (10.6X2)
Condenser -> riser hose = S, 999 707 250 40 (10.6X2)
Riser hose > Dryer hose = S, 999 707 250 40 (10.6X2)
Hose -> Dryer = XS2, 999 707 262 40 (6.7X1.8) PET20
Dryer -> dryer block = XS2, 999 707 262 40 (6.7X1.8) PET20 XS1
Dryer block -> crossover pipe = XS1 999 707 247 40 (7.5 x2) PET16
crossover pipe -> Exp Valve = XS1 999 707 247 40 (7.5 x2) PET16
Exp Valve -> Evaporator= M 999 707 596 40 (14x1.82)
Evaporator -> Expansion Valve = S 999 707 250 40 (10.6X2)
Expansion Valve -> Pipe = L, 999 707 252 40 (17X2)
Pipe -> Hose = L, 999 707 252 40 (17X2)
Hose -> Fuel cooler = L, 999 707 252 40 (17X2)
Fuel cooler -> pipe = L, 999 707 252 40 (17X2)
Pipe -> Compressor = XL 999 707 382 40 (23.8X2.4)

The four in blue are the o-rings used on both sides of the expansion valve you took a picture of. I'd start there...

Dguth

Quick update on this. It was the AC pressure switch that went bad. Just a $100 part to replace but cost more to refill all the refrigerant as it blew everything out. Car is back to normal now and ready for track weekend at Mid OH next weekend. Just hope weather cooperates

Mdnyte

Hmm, looks like Im facing a similar issue, white smoke in the cabin. Cleaned up the oil and getting ready to take it to the shop, but is it ok to drive like this? I also did notice all the fans in front coming on even a minute after start up, is that a concern? Or ok to drive to the shop, about an hour away.

lliejk

Have you checked your coolant level? Any unexplained drop in level?

The last time I saw steam from my vents was when my heater core blew (that was at 23 years and 280K old on an Audi). When a A/C press sensor popped (also an Audi) it just blew out steam from the condenser (front) of the engine bay. Never had one go on a 911, but the airflow on the Porsche is probably totally different than Audi.

Just use ECO on the climate control and keep an eye on your temp gauges to make sure everything is normal.

How far is it to the shop? 15 mins is a big difference than 90.

Ed

Mdnyte

Coolant level is ok, just never heard the fans run so early, trip is about an hour on highway

lliejk

OK that's good. When my A/C went and blew white smoke on the S6, it was the pressure sensor. The fans started to run early and often after that and I drove it for a while until I could get the repair done.

As long as you don't use the A/C, you should be good to go.

Ed