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johne
Silverstone


Joined: 07 Apr 2008
Posts: 100



PostPosted: Tue Jun 13, 2017 9:08 pm    Post subject: air conditioning Reply with quote

had a new air con pump and re gas when I bought the car but it dosent seem to blow out coldish air .its only been on a year .can I get it tested ?
 
  
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Mike-M
Spa-Francorchamps


Joined: 28 Jan 2010
Posts: 253



PostPosted: Tue Jun 13, 2017 9:44 pm    Post subject: Re: air conditioning Reply with quote

johne wrote:
had a new air con pump and re gas when I bought the car but it dosent seem to blow out coldish air .its only been on a year .can I get it tested ?


This can be a very expensive problem to chase around and I know this personally!! However in replacing about 90% of the system I tracked my leak down to the hoses that run in the sills. When the system is tested they place it under vacuum conditions, this itself is a prblem as my system always passed this test. The problem being a rubber bracket that the pipework runs through rubs over time, wering a hole in the pipe. When the system is put under vacuum, it sucks the rubber bracket tight to the pipe, blocking the hole. Porsche did re-design the braccket as it was a known issue. Its a rather cheap fix compared to most other options so I'd check this 1st then go through the check list of condenser, evaporator etc etc you may be unlucky and have a few leaks like myself.
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1994 Aventura 993 C2 manual
 
  
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ColinC
Österreich


Joined: 16 May 2013
Posts: 875
Location: Sunny Central Scotland


PostPosted: Tue Jun 13, 2017 10:04 pm    Post subject: Reply with quote

Mine also had the rubber bracket issue not detected during vacuum test - there is a Porsche TSB on the issue - can be found at the link below and on this forum as well I'm sure......

http://www.pcarworkshop.com/images/7/7c/8743_1996_6tu80196geolab.pdf
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94 993 C2 - Black with Marble Grey Leather
 
  
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ColinC
Österreich


Joined: 16 May 2013
Posts: 875
Location: Sunny Central Scotland


PostPosted: Tue Jun 13, 2017 10:04 pm    Post subject: Reply with quote

Double post....
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94 993 C2 - Black with Marble Grey Leather

Last edited by ColinC on Wed Jun 14, 2017 7:41 am; edited 1 time in total
 
  
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Ridders
Monza


Joined: 20 Feb 2008
Posts: 196
Location: Rochdale


PostPosted: Tue Jun 13, 2017 10:19 pm    Post subject: Reply with quote

I had the compressor replaced then a re gas, didn't work. Leak then traced to pipes in the sill & possibly the evaporator. As the evaporator change is very labour intensive (petrol tank out etc) I decided to just go for the pipes (these being quite a few hundred £'s each Surprised themselves)

So far so good Very Happy

Good luck
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Zingari
Donnington
Donnington


Joined: 25 Oct 2009
Posts: 11664
Location: Cheshire

1993 Porsche 964 Anniversary

PostPosted: Tue Jun 13, 2017 11:28 pm    Post subject: Reply with quote

My money is on the evaporator being knackered what It's only a matter of time.............

If you used Meccano as a kid you could DIY. Not very technical but labour charges aren't cheap. The part is less than £100

http://p-car.com/diy/ac/

Get it tested for leaks first Thumb
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Endoman
Imola


Joined: 11 Apr 2011
Posts: 815
Location: Bolton U.K.


PostPosted: Wed Jun 14, 2017 12:54 am    Post subject: Reply with quote

Pipes replaced twice, because they used the old rubbers which were coated with Aluminim oxide, a very good abrasive. now the evaporator has gone. Luckily my mate Jim who has a 993 has done one on a 964, not that he liked doing it. He reckons it's just an age thing. He replaced the pump not long ago so I may as well get the condensor done at the same time. A good right up on pelican and pcar but not a practical diy unless you have the facilities.
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Porsche 993 Coupe 9m RS Replica
 
  
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ToreB
Approved Trader


Joined: 13 May 2010
Posts: 535
Location: Oslo, Norway


PostPosted: Wed Jun 14, 2017 6:40 am    Post subject: Reply with quote

How cool is the air coming out of the dash vents? Test conditions:
About 20 degrees ambient and no sun
Engine warm and idling
Doors and windows closed
CCU settings: Min temp, max fan, Resirc on, upper slider to leftmost position. (or big snowflake button pressed)
Measure at dashboard centre vents, you should read 7-9 degrees C.

Is the A/C compressor cycling on and off at engine idle? If so, pressure is OK in the cooling system, and you do not have a leak.

As mentioned above, the most common failing part in the A/C cooling system is the evaporator. This is easily checked by a A/C technician using a electronic sniffer. They can poke the instrument through the resirculation flap under the dashboard, right onto the evap radiator.

The most common fault in the ventilation system is failing servo motors. One or both of the mixer servos may have given up the ghost, and may have stopped in the open position. Heated air from the engine will then overshadow any A/C cooled air.

Servo testing is easy, see my DIY pages.
Cheers,
Tore
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'95 993 C4

Bergvill F/X
Porsche electronics specialists, products and repair services.
 
  
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johne
Silverstone


Joined: 07 Apr 2008
Posts: 100



PostPosted: Wed Jun 14, 2017 8:58 pm    Post subject: air conditioning Reply with quote

thanks tore
 
  
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johne
Silverstone


Joined: 07 Apr 2008
Posts: 100



PostPosted: Thu Jun 15, 2017 9:43 pm    Post subject: air conditioning Reply with quote

one question why is the cold air blower stronger than when I have the air con switched on . is this normal ?
 
  
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ToreB
Approved Trader


Joined: 13 May 2010
Posts: 535
Location: Oslo, Norway


PostPosted: Fri Jun 16, 2017 6:36 am    Post subject: Reply with quote

Most probably by a non-functioning resirculation flap.
The Resirc flap is vacuum operated, and a leak somewhere will cause it to not open fully when needed. If the cabin temperature is sufficiently higher than the desired, (temp setting) the CCU will close all other air sources (fresh air and mixer flaps) when you press A/C and rely on tdrawing air through the resirc flap only. If this is not fully open, it will limit the air volume significantly.
I guess revving the engine will affect this, with a whoomph sound or similar at high fan speeds when the flap closes due to the reduced vacuum.
Details in chapter VACUUM OPERATED RECIRCULATION FLAP here:
https://www.bergvillfx.com/porschehvac2
Cheers,
Tore
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Bergvill F/X
Porsche electronics specialists, products and repair services.
 
  
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johne
Silverstone


Joined: 07 Apr 2008
Posts: 100



PostPosted: Sun Jun 18, 2017 5:00 am    Post subject: air conditioning Reply with quote

well I tested the car yesterday .and the aircon is deffinatley not working properly . as for fixing not to sure I could do this myself haven't the tools,time and technical knowledge .unless the replacing of the lines and new rubber holders is do able by a non professional .I can easily live without the aircon but it seems a shame to have a brand new pump and for it not to work as the car is carrying the extra weight .so any advice on who to use and a ball park figure on cost .getting the check strap done this month so it may have to wait a couple of months. I still love this car Smile
 
  
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Zingari
Donnington
Donnington


Joined: 25 Oct 2009
Posts: 11664
Location: Cheshire

1993 Porsche 964 Anniversary

PostPosted: Sun Jun 18, 2017 10:11 am    Post subject: Reply with quote

Get the fault diagnosed first by an AC specialist using the UV dye. That way you will have an idea what needs replacing as it could be simple.

Condensor should be a few hundred, evaporator near £1k because of labour. My Indy has experience of doing the evaporator as he has done one in my 993 and then 964 Rolling Eyes so he's got it sorted and will probably do a good deal.

Where you based?
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rob_watti
Trainee


Joined: 11 Apr 2011
Posts: 52
Location: Skipton, N.Yorks


PostPosted: Sun Jun 18, 2017 10:28 am    Post subject: Reply with quote

As said above a vacuum hold leak test DOES NOT find all leaks. We us Nitrogen to fill the A/C system and then trace the leak that way.
 
  
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Pretzel
Hockenheim


Joined: 20 Apr 2014
Posts: 625
Location: Bedfordshire


PostPosted: Sun Jun 18, 2017 2:37 pm    Post subject: Re: air conditioning Reply with quote

johne wrote:
well I tested the car yesterday .and the aircon is deffinatley not working properly . as for fixing not to sure I could do this myself haven't the tools,time and technical knowledge .unless the replacing of the lines and new rubber holders is do able by a non professional .I can easily live without the aircon but it seems a shame to have a brand new pump and for it not to work as the car is carrying the extra weight .so any advice on who to use and a ball park figure on cost .getting the check strap done this month so it may have to wait a couple of months. I still love this car Smile


Replacing the pipes and rubber supports isn't difficult, once you get the near side sill cover and wheel arch liners off its fairly obvious.

The other alternative as it sounds like a smallish loss is to get the system re-gassed (£30) compressor and air-con should then work, keep an eye on compressor engagement as an indication of vacuum loss.

You won't be the only 993 owner who gets the system re-gassed each year in the knowledge that it will only last a few months.
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Zingari
Donnington
Donnington


Joined: 25 Oct 2009
Posts: 11664
Location: Cheshire

1993 Porsche 964 Anniversary

PostPosted: Sun Jun 18, 2017 3:54 pm    Post subject: Reply with quote

Just be mindful if they do 'detect' a small leak they are not allowed to fill it as it's illegal to let the stuff off into the atmosphere Whistling
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GT917
Trainee


Joined: 10 May 2015
Posts: 54



PostPosted: Sun Jun 18, 2017 4:29 pm    Post subject: Reply with quote

From my side, after replacing AC radiator on the left front (PITA DIY by the way), it worked for about 1month, then nothing ... must have a tiny leak somewhere ?
 
  
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Zingari
Donnington
Donnington


Joined: 25 Oct 2009
Posts: 11664
Location: Cheshire

1993 Porsche 964 Anniversary

PostPosted: Sun Jun 18, 2017 5:06 pm    Post subject: Reply with quote

Mine was fixed in the 964 2+yrs ago - new condensor, evaporator, receiver dryer, expansion valve Rolling Eyes

It's still holding charge and works OK although I do find in hot weather, like today, you have to close the sunroof and windows to get the optimum cooling effect as it's not a patch on modern systems but does its job Thumb
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johne
Silverstone


Joined: 07 Apr 2008
Posts: 100



PostPosted: Sun Jun 18, 2017 9:07 pm    Post subject: air conditioning Reply with quote

thanks for the advice everyone you have all been very helpfull
 
  
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