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AC Compressor not spinning


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Dear all

Probably a 996 universal topic but put it in the 996TT section anyway. Noted today that my AC is not working. When I got home I found out that the magnetic clutch does not engage. Outer pulley runs but does not engage the AC. I checked all fuses, all ok, checked the power cable, ok too.

Do the magnetic clutches just fail sometimes? Or do you have another idea?

Thanks

Ronny

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Fedmax, do you know if yours fans are working. With Durametric you can test the three speeds of the fans and you can also get the compressor to work. If they work a low coolant level can also be a cause of malfunction.

Fuse to check: Radiator fan fuse should also be checked C8 and C10, D6 for the compressor, E7 a/c,

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Dear all

Probably a 996 universal topic but put it in the 996TT section anyway. Noted today that my AC is not working. When I got home I found out that the magnetic clutch does not engage. Outer pulley runs but does not engage the AC. I checked all fuses, all ok, checked the power cable, ok too.

Do the magnetic clutches just fail sometimes? Or do you have another idea?

Thanks

Ronny

These systems have multiple electronic sensors (high pressure, low pressure, high temperature, etc,) anyone of which can shut off the clutch on the compressor to prevent further damage to the system. Unless you have the tools and knowledge to diagnose and service this system, you would be better off taking the car to someone that does. And do not try to just add more R134A with one of the cheap aftermarket fill kits; if the system already has the correct fill level, you will overfill it, and when you did get the compressor to run, you could end up doing some very expensive damage.

Edited by JFP in PA
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Sounds like low refrigerant.

If you are mechanically inclined (i.e. can do an oil change or brake work), then AutoZone loans out AC vacuum pumps and manifold guages. Very easy to evac, check for leak, and recharge.

Good luck.

Michael.

It was! We now filled it with UV light sensitive fluid and hope we find the leak... Thanks!

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  • 1 month later...

Sounds like low refrigerant.

If you are mechanically inclined (i.e. can do an oil change or brake work), then AutoZone loans out AC vacuum pumps and manifold guages. Very easy to evac, check for leak, and recharge.

Good luck.

Michael.

It was! We now filled it with UV light sensitive fluid and hope we find the leak... Thanks!

Found the leak, it was the left air condenser, pictures here:

http://porsche996turboblog.blogspot.com/2011/08/issue-ac-not-working.html

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Thanks for the good feedback - I'll keep on working on it...tomorrow updates on condenser exchange and also fuel filter.

Air conditioning condensor replacement step by step including A/C dryer (for which strangely no entry exists in the Porsche Workshop Manual):

http://porsche996turboblog.blogspot.com/2011/09/ac-condenser-exchangereplacement.html

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