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C11BRA
Montreal


Joined: 30 Mar 2015
Posts: 538
Location: North London. Herts.


PostPosted: Sat Aug 31, 2019 9:57 pm    Post subject: New 997 owner. AC works, then cuts out? Gas topped up. Reply with quote

Hello 997 guys. I’ve been kicked out of the 996 forum after selling my 98 C2.
I had it for 7 years and many 996 forum guys will have seen many of my modifications (some not universally liked).

Anyway. I’ve treated myself to a 2006 997 C2. Ooooh. I like it.

It’s had quite a nice amount of upgrades but one of these was an AC compressor bypass. Basically, a non AC belt was fitted at the same time as an IPD plenum & the larger throttle housing. I’m guessing to save half a horse power.

My first job was to fit the AC sized belt. I added some DIY gas to check for immediate leaks from the usual suspects, condensers, pipes & joints. The gas held & the AC blew cold. Great.....I’ll just keep an eye on it and in a week or so I’ll get it all vacced out & re-gassed properly.

We jumped in the car and went to the BH Monday Ace cafe meet. About half way there (approx 10 miles) we hit a bump in the road & the AC started blowing warm. Could have been coincidence. After about 5 minutes, it started blowing cold again. Hmmmmm.

After a lovely Ace meet, we drove home with AC......initially. About half way, it blew warm again. No bump this time. And this time, it didn’t come back on.

I plan to get the proper re-gas done on Thursday but just wondered if there is a common fault that might fit my symptoms.

Any ideas will be appreciated.
_________________
Racing Gold. We turn F1 & Exotic car parts into gifts, art & furniture.

2006 997 C2 Man. Non sunroof.
2018 Audi A4 Avant Black Edition.
Ex 996 C2 Man.
Ex Ram Cobra V8.
Ex Series 1 RS Turbo.

 
  
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C4Silver
Silverstone


Joined: 14 Aug 2019
Posts: 146



PostPosted: Sat Aug 31, 2019 11:57 pm    Post subject: Reply with quote

Sounds like it was on the verge of making up its mind over whether it was holding pressure, if it’s leaking out which it probably is then it’s probably hit the minimum before shutting itself off for safety reasons.

It’s either that or Bore Scoring, and I know very little about that as well !
 
  
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C11BRA
Montreal


Joined: 30 Mar 2015
Posts: 538
Location: North London. Herts.


PostPosted: Sun Sep 01, 2019 1:02 am    Post subject: Reply with quote

I’ll report back on Thursday. Tbh. I can’t wait to just drive it again.

New V5 should arrive this week so I’m taxed, reg transferred, insured and legal to drive.

Big welsh mountain road drive planned foe November. Must get the AC working for then.
_________________
Racing Gold. We turn F1 & Exotic car parts into gifts, art & furniture.

2006 997 C2 Man. Non sunroof.
2018 Audi A4 Avant Black Edition.
Ex 996 C2 Man.
Ex Ram Cobra V8.
Ex Series 1 RS Turbo.

 
  
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Cannop
Trainee


Joined: 27 Feb 2018
Posts: 70
Location: Berks/Oxon border


PostPosted: Sun Sep 01, 2019 8:50 am    Post subject: Reply with quote

The AC pump clutch could be disengaging intermittently when running. If this is the case either the clutch is faulty or there's a dodgy connection in the harness somewhere.
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C4Silver
Silverstone


Joined: 14 Aug 2019
Posts: 146



PostPosted: Sun Sep 01, 2019 8:54 am    Post subject: Reply with quote

Good luck, come November in Wales you’ll not be needing air con....


I’m supposed to be going Next weekend and doing the Triangle, Brecon and a few other Routes.
 
  
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7184
Location: Brighton


PostPosted: Sun Sep 01, 2019 5:34 pm    Post subject: Reply with quote

Sorry to not see you in the 996 forum any more .


Welcome to the 997 forum where i will see you Very Happy


Gas will slowly leak out over a period of time .. a bump in the road won't make it stop working and then work again due to the amount of gas in the system .

these are the same as all porsches .. as the gas starts to get low you will get noises in the cabin which go when you turn off the a/c ... easy check to see if the system is low on gas basically .

Whilst i don't have an answer im leaning towards a temp sensor messing around .. electrics do respond to bumps and will stop / start in their operation ... so compressor , sensors control unit etc etc ..

A tester on these and you can soon see if an interior temp sensor is reading incorrect... you can also check fault codes .. 997 is a wee bit more advanced than a 996 .. which is good .. and not so good as there's more things that can go wrong .

Curious the system had been bypassed through .. there's a reason for that and i dont feel its horsepower .
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She's not going until july 2020 though .



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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 16682
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Sun Sep 01, 2019 6:27 pm    Post subject: Reply with quote

Sounds to me like it could be an intermittent electric fault. Next time it goes warm run round the back and see that the electro-magnetic clutch is engaged.
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Supersport Mike
Newbie


Joined: 08 Mar 2013
Posts: 31
Location: Buckingham


PostPosted: Sun Sep 01, 2019 7:40 pm    Post subject: Reply with quote

I had a similar problem with my a/c blowing cold then warm ,had it re- gassed blew cold for about a week then warm again...………..anyway the problem was the a/c pipes. where they are fixed to the body the pipes run through fixing clamps which are quite big and they rust ,so by removing the clamp you can see the problem (a small pin hole) so metal fix and a jubilee clip done the job

Just out of interest to renew the pipes is an engine out job

Hope that helps
 
  
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C11BRA
Montreal


Joined: 30 Mar 2015
Posts: 538
Location: North London. Herts.


PostPosted: Sun Sep 01, 2019 8:28 pm    Post subject: Reply with quote

C4Silver wrote:
Good luck, come November in Wales you’ll not be needing air con....


I’m supposed to be going Next weekend and doing the Triangle, Brecon and a few other Routes.


Let me know if you find any must do roads. I’m still researching my route.

BTW. My wife needs AC. Even when it’s snowing!!??
_________________
Racing Gold. We turn F1 & Exotic car parts into gifts, art & furniture.

2006 997 C2 Man. Non sunroof.
2018 Audi A4 Avant Black Edition.
Ex 996 C2 Man.
Ex Ram Cobra V8.
Ex Series 1 RS Turbo.

 
  
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C11BRA
Montreal


Joined: 30 Mar 2015
Posts: 538
Location: North London. Herts.


PostPosted: Sun Sep 01, 2019 8:30 pm    Post subject: Reply with quote

Thanks for all your replies. I’ll be ready in my next trip to jump out with a meter to check compressor supply feed.
_________________
Racing Gold. We turn F1 & Exotic car parts into gifts, art & furniture.

2006 997 C2 Man. Non sunroof.
2018 Audi A4 Avant Black Edition.
Ex 996 C2 Man.
Ex Ram Cobra V8.
Ex Series 1 RS Turbo.

 
  
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C11BRA
Montreal


Joined: 30 Mar 2015
Posts: 538
Location: North London. Herts.


PostPosted: Sun Sep 01, 2019 8:38 pm    Post subject: Reply with quote

deMort wrote:
Sorry to not see you in the 996 forum any more .


Welcome to the 997 forum where i will see you Very Happy


Gas will slowly leak out over a period of time .. a bump in the road won't make it stop working and then work again due to the amount of gas in the system .

these are the same as all porsches .. as the gas starts to get low you will get noises in the cabin which go when you turn off the a/c ... easy check to see if the system is low on gas basically .

Whilst i don't have an answer im leaning towards a temp sensor messing around .. electrics do respond to bumps and will stop / start in their operation ... so compressor , sensors control unit etc etc ..

A tester on these and you can soon see if an interior temp sensor is reading incorrect... you can also check fault codes .. 997 is a wee bit more advanced than a 996 .. which is good .. and not so good as there's more things that can go wrong .

Curious the system had been bypassed through .. there's a reason for that and i dont feel its horsepower .


Yeah. I’m slightly suspicious about the compressor bypass. But it was done in conjunction with engine upgrades so I’m hoping it was just a badly advised performance move.

I have an Autel diag tool. Do you think I’ll be able to see sensor values? After the re-gas, I’ll road test & monitor.

Is there a wiring diagram of the 2006 997 AC system available anywhere? I quite like understanding where all the sensors are & relays etc.

I MUST GET THE A/C RELIABLE!!!
_________________
Racing Gold. We turn F1 & Exotic car parts into gifts, art & furniture.

2006 997 C2 Man. Non sunroof.
2018 Audi A4 Avant Black Edition.
Ex 996 C2 Man.
Ex Ram Cobra V8.
Ex Series 1 RS Turbo.

 
  
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 16682
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Mon Sep 02, 2019 6:57 am    Post subject: Reply with quote

Could also be your expansion valve playing up. Might be a bit sticky if the system hasn't been used for some time. Had a similar problem with my Dad's Saab years ago.

I suggest you leave the system on full time when using the car to get everything well lubricated and operational.
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Supersport Mike
Newbie


Joined: 08 Mar 2013
Posts: 31
Location: Buckingham


PostPosted: Mon Sep 02, 2019 8:40 am    Post subject: Reply with quote

Buy the way love the GT3 Look ,I thinking about doing the same to mine ….NO GT3 badge
 
  
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7184
Location: Brighton


PostPosted: Mon Sep 02, 2019 6:37 pm    Post subject: Reply with quote

@ C11BRA


PM sent .
_________________
.

My Daughter's Crowdfunding has hit the target see Here

Thank you all so Very much .

She's not going until july 2020 though .



Mechanic

7pm - 9pm

Now At An Indy.
 
  
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C11BRA
Montreal


Joined: 30 Mar 2015
Posts: 538
Location: North London. Herts.


PostPosted: Mon Sep 02, 2019 8:14 pm    Post subject: Reply with quote

Just had a quick look around the AC pipes etc to see if there was any sweating etc. Thought I’d check the AC clutch connection. With hardly any force, the connector came apart. And inside (the male spade) was pretty grubby looking. Hmm. Why would Porsche still use this same 1980’s style connector when pretty much all the others are submarine spec!!!




So. I’ve cleaned the male spade, given the female a slight nip with a pair of long noses and fitted back together with a coating of special connector grease.
Thursdays road test will reveal any improvement or not.
_________________
Racing Gold. We turn F1 & Exotic car parts into gifts, art & furniture.

2006 997 C2 Man. Non sunroof.
2018 Audi A4 Avant Black Edition.
Ex 996 C2 Man.
Ex Ram Cobra V8.
Ex Series 1 RS Turbo.

 
  
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C11BRA
Montreal


Joined: 30 Mar 2015
Posts: 538
Location: North London. Herts.


PostPosted: Mon Sep 02, 2019 8:24 pm    Post subject: Reply with quote

Checked for fault codes and found this.

Another clue.




Any ideas?

P1632.
_________________
Racing Gold. We turn F1 & Exotic car parts into gifts, art & furniture.

2006 997 C2 Man. Non sunroof.
2018 Audi A4 Avant Black Edition.
Ex 996 C2 Man.
Ex Ram Cobra V8.
Ex Series 1 RS Turbo.

 
  
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Mad Mark911
Silverstone


Joined: 16 Dec 2011
Posts: 129
Location: Maidenhead


PostPosted: Mon Sep 02, 2019 9:42 pm    Post subject: Reply with quote

I have one theory in that I once used a DIY tin to get my system running again and I actually over pressurised my system on my Scooby Impreza when it was four years old. Which meant as the engine warmed up, the pressure sensors told the compressor to disengage the magnetic clutch. After, a few minutes of running.

The other thing I found out was that when I took it to the aircon specialist - their first thought was that the clutch was wearing out (there was a lot of dust around it) and they suggested as it heated up, it would be less and less effective.

Anyway, they checked the pressure, said it was too high, vacuumed it all out and refilled with new oil and refrigerant. It then worked perfectly for another 5 years!
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7184
Location: Brighton


PostPosted: Tue Sep 03, 2019 6:43 pm    Post subject: Reply with quote

As per PM .. link here with the same fault ..

http://www.911uk.com/viewtopic.php?t=116308&sid=51d8209948073e9f529c436772b4579d

Compressor connection certainly won't help .. see if it makes a difference but judging from the fault code then perhaps not .
_________________
.

My Daughter's Crowdfunding has hit the target see Here

Thank you all so Very much .

She's not going until july 2020 though .



Mechanic

7pm - 9pm

Now At An Indy.
 
  
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C11BRA
Montreal


Joined: 30 Mar 2015
Posts: 538
Location: North London. Herts.


PostPosted: Thu Sep 05, 2019 9:32 pm    Post subject: Reply with quote

All re-gassed and now under test. Hoping the poor compressor connection was the main fault.

I will monitor & update this post in a few months.
_________________
Racing Gold. We turn F1 & Exotic car parts into gifts, art & furniture.

2006 997 C2 Man. Non sunroof.
2018 Audi A4 Avant Black Edition.
Ex 996 C2 Man.
Ex Ram Cobra V8.
Ex Series 1 RS Turbo.

 
  
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GlenB
Silverstone


Joined: 20 Jul 2018
Posts: 102



PostPosted: Fri Sep 06, 2019 5:47 am    Post subject: Reply with quote

It's almost certainly the DIY bodge recharge that's the problem. If you've now had it vac'd and charged properly is suspect your problem will be resolved.
 
  
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