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Loren, any thoughts on A/C not cooling anymore


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Hey Loren, As you know last year I dropped my motor to do the EVOMS GT700 kit, at the time we did not disconnect the A/C lines or remove the refrigerant from the system, we were able to unbolt the compressor motor from the engine and leave it hanging there.

Of course the A/C worked perfectly last summer but I dropped the motor in September so did not use the A/C after that. Today I turn the A/C on for the first time this year and all appears to be working except we get no cooling. The fuses are all OK, the fan motors work, you hear the A/C relay come on when you activate the A/C button, the engine revs also go up to compensate for the compressor load...all looks OK....

Of course I could just have a leak in the system, will have that check on Thursday...just trying to get some ideas. Checked my Porsche shop manual, just gives the usual info. I have no Porsche dealer in town so I am leary to have a regular A/C hack place work on my car...

Any advice would be much appreciated.

Cheers,

Ben

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The usual cause of no cooling is a refrigerant leak. Any good AC shop should be able to test that.

If there is a leak your average shop may not find it. Still your best bet is a Porsche "aware" AC shop.

Usually the local Porsche club should have a few folks to recommend. Where are you located again?

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The usual cause of no cooling is a refrigerant leak. Any good AC shop should be able to test that.

If there is a leak your average shop may not find it. Still your best bet is a Porsche "aware" AC shop.

Usually the local Porsche club should have a few folks to recommend. Where are you located again?

Kelowna, British Columbia, Canada..closest dealer is 400 KM away....big sigh....I may take it to the local BMW or Mercedes dealership and see what they say...thats the trouble with living in the sticks.

I think its a leak.....thanks for getting back to me so quickly, I will report back my findings..

Ben

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http://www.boxa.net/forum/index.php?showtopic=22137&hl=

You should be able to get a self regas kit with gauge by mail order. If your car doesn't maintain pressure, then what I would suggest doing is removing the front bumper and vacuum testing the condensers. This presumes that you don't have a compressor hose leak...

http://www.realtime.net/~rentner/Porsche/R...r/Radiator.html

However, a decent aircon shop should be able to pressure test the car aircon system and do leak detection. My leak on the Boxster was actually in the inlet line running down the underside of the car, although I suspect one of the radiators had started leaking before that.

How old is your car, and I assume it gets wet quite often where you are?

PS If it is the condensor(s) make sure you get the right part no. I ended up with a C4S one that is different from the 986/996 one. I see the 996TT condensor has a different part number too.

Edited by Paul Fraser
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http://www.boxa.net/forum/index.php?showtopic=22137&hl=

You should be able to get a self regas kit with gauge by mail order. If your car doesn't maintain pressure, then what I would suggest doing is removing the front bumper and vacuum testing the condensers. This presumes that you don't have a compressor hose leak...

http://www.realtime.net/~rentner/Porsche/R...r/Radiator.html

However, a decent aircon shop should be able to pressure test the car aircon system and do leak detection. My leak on the Boxster was actually in the inlet line running down the underside of the car, although I suspect one of the radiators had started leaking before that.

How old is your car, and I assume it gets wet quite often where you are?

PS If it is the condensor(s) make sure you get the right part no. I ended up with a C4S one that is different from the 986/996 one. I see the 996TT condensor has a different part number too.

Thanks guy's, I think it is a leak of some kind mind you there is no sign of oil anywhere from any of the fittings....I think it is going to be something simple. Stangely enough I live in a semi desert area of BC, we only get 30 cm of rain a year so its not that wet here. Thanks for all the tips, I will endevour to track this problem down soon as its supposed to be 33 C today...

Cheers,

Ben

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My wife's Boxsters exhibited the same symtoms. Everything worked but the air was blowing warm. I had a Porsche Tech friend tell me a simple recharge would correct it. I bought a kit with refrigerant and a gauge and recharged it. It works better than ever and is iced cold. A note: when I hooked up the gauge the pressure was in the lower part of the working range, before adding more refrigerant, but still not blowing cold. Seems these systems loose small amounts with no detectable leaks.

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My wife's Boxsters exhibited the same symtoms. Everything worked but the air was blowing warm. I had a Porsche Tech friend tell me a simple recharge would correct it. I bought a kit with refrigerant and a gauge and recharged it. It works better than ever and is iced cold. A note: when I hooked up the gauge the pressure was in the lower part of the working range, before adding more refrigerant, but still not blowing cold. Seems these systems loose small amounts with no detectable leaks.

Problem fixed....under futher examination, I noticed connector A1 (green wire) had come loose for the its spade connector. This actuates the A/C compressor, looks like a ground or return wire to me, anyway all is good...had a feeling is was something simple.

Thanks for all your help guy's....as always folks on here are always happy to help other board members.

Cheers all.

Ben

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Yeah, glad you got it fixed but how do you explain the change in engine revs, which you thought was associated with compressor load? Just curious now, :)

Paul, That is a very good point, the engine revs went up for sure which is what confused me too as that would assume the compressor would be running. The only reason for the idle to increase would be the compressor load...now I am scratching my head.... <_<

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Paul, That is a very good point, the engine revs went up for sure which is what confused me too as that would assume the compressor would be running. The only reason for the idle to increase would be the compressor load...now I am scratching my head.... <_<

The engine revs will go up when the AC is switched on but compressor not activating. The AC control unit tells the DME its on and the DME in turn alters the torque of the engine to compensate for the extra load of the compressor. By doing this, you shouldn't notice a difference when the compressor engages. However, in your situation, the AC was trying to switch on the compressor (but couldn't because of the loose connection) and the DME increased torque for a load that wasn't there.

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Paul, That is a very good point, the engine revs went up for sure which is what confused me too as that would assume the compressor would be running. The only reason for the idle to increase would be the compressor load...now I am scratching my head.... <_<

The engine revs will go up when the AC is switched on but compressor not activating. The AC control unit tells the DME its on and the DME in turn alters the torque of the engine to compensate for the extra load of the compressor. By doing this, you shouldn't notice a difference when the compressor engages. However, in your situation, the AC was trying to switch on the compressor (but couldn't because of the loose connection) and the DME increased torque for a load that wasn't there.

Bloody Hell Basil Brush!!!! Boom Boom...My God its been years since I have seen him.....being an ex pat!...Thanks for the DME lesson, its all clear as crystal now...Cheers,

Ben

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Postscript to the self regassing above: the aircon guy came around today and said that there have been problems with the sealant in the cans as it solidifies on contact with mositure and one guy he knew (Merc) lost a compressor. So if you think you have a leak and the system has been open to atmosphere take care, or at least fit a new dessciant first.

Will find out what has happened to my 996 in a month when he comes back....

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