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Air Conditioner advice for my 964 C2

Old 07-08-2012, 12:56 PM
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Default Air Conditioner advice for my 964 C2

My 1992 air conditioner was blowing warm air. The system was converted to R134 before I got the car about 8 years ago. I have had to recharge the system about 3 times since I got it. I took it to my mechanic and he recharged the system and it was blowing cold air. A week later, when I used the AC, it did not blow cold air. Took it back and he recharged again, waited a couple of hours and saw that the freon was leaking out of the cars drain hole, the drain that the condensation comes oiut from. He had put in dye to trace leakage. He is mainly a BMW guy and is not an AC expert, but feels that the evaporator core is bad and needs replaced. Part is over $700 and 11 hours to do. I don't feel it is worth the cost since I don't use the AC much and don't want the dash removed to get to the core. The car is in perfect shape with only about 30K miles. Any advice other then to not repair the AC.

1992 964 C2, 30,000 miles
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Old 07-08-2012, 01:25 PM
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Evaporator replacement DIY

Replacement evaporator
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Old 07-08-2012, 01:55 PM
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Evaporator leaks are sadly often seen, especially in the 993. My mech has done it several times, and did it in 10 hours.
Good luck.
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Old 07-09-2012, 12:58 AM
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You don't remove the dash to fix it. It is all in the front hood area. not that hard, just takes some patience.
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Old 07-09-2012, 09:37 PM
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Thanks Vandit for the links. If I decide to have it done it will be very helpful. I am afraid it is beyond my skill level but my mechanic will be able to use these to cut down on the time it takes him.
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Old 07-10-2012, 07:27 AM
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I had a similar situation. Filled with R-12, blew cold air for a day, then nothing. It turned out to be a leaking condenser. Not hard to replace(driver's side front wheel well). Might want to make sure, it's not this, although, Freon coming from the condensate drain, suggests evaporator.
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Old 07-11-2012, 07:07 PM
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Change my evaporator and valve a few years ago, I didn't both the parts from Porsche , it was nearly 5 Time cheaper....
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Old 08-24-2016, 10:34 PM
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Noticed my a/c wasn't cool, went in for a check. They 'did their thing' and ultimately re-charged the system and when ready to leave the shop I turned the a/c on and 'the refrigerant' spewed out thru the vent system into the cabin...cough-cough. I assume the evaporator and/or expansion valve are to blame. Thoughts? Thanks.
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Old 08-24-2016, 10:54 PM
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Replacement evaporator

Local AC shop did mine for $1k labor plust the Griffiths parts. I stayed with R12 and the system works GREAT !
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Old 08-25-2016, 11:43 PM
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I have replaced the evaporator, not fun, in my 1991 C2. Currently have a leaking hose in the engine compartment. But got to have A/C.
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Old 08-26-2016, 12:40 PM
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2800 plus parts to replace here. will only use Porsche parts.
bottom line around 4000 bucks. seems like highway robbery to me.
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Old 08-26-2016, 03:07 PM
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A big job. I completely rebuilt the system last winter. New evaporator, expansion valve, receiver dryer, condenser, compressor. Removed and flushed/cleaned all lines. I replaced the rubber hoses in the engine bay a few years ago because of leakage so those are reused. All new o-rings at every connection. I have no idea how many hours i worked on it, was a long project. When the weather was hot enough I adjusted the R12 charge and the system worked great for an hour or so then began to blow warm air. That fault was traced to the evaporator sensor location. The original spot in center of evaporator seemed to be the warmest spot on the coil so the compressor would not cycle to keep the coil ice free. I found an old Rennlist post that outlined moving the sensor to a lower spot on the evaporator coil and that solved the issue, the compressor now cycles as it should and the coil does not freeze. On 90 degree day I'm getting approx 50 degree discharge temperature, not as cold as I had hoped for but much better than before. By the way the evaporator I used is the Griffin serpentine, nice kit.

Last edited by 540964; 08-26-2016 at 03:10 PM. Reason: Added info
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