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What kind of AC refridgerant pressure should i be looking for on a 02

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2002 4s

My car blows pretty cold, but i do hear some groan from the compressor - I suspect the refridgerant is a bit low and might not have enough lubrication for the compression. What are the high/low side pressures I should be looking at to make sure it's all topped off?

Porsche replaced couple AC lines and refilled it about a year back; not sure if they topped it completely.

Edited by halik
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Refill is 900 g refrigerant R 134a.

Check for leaks first though...

That's for an empty, vacuumed system, right? My car definitely has refridgerant and blows cold... I jsut want to check to make sure it's got the proper amount of it and proper amount of oil.

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The only way to know if the correct amount of oil and gas is in the system is to remove the gas with a freon capture unit, which will pump it out and measure it; and then remove several mechanical system components and pour out the oil and measure it (Porsche publishes a reference table for doing this). Neither is exactly a "backyard" DIY project as the system would then need to be correctly reassembled, evacuated and recharged with gas and oil before it would work again.

If the system is working properly, leave it alone; adding too much oil or gas can be disasterous.

Edited by JFP in PA
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Added refrigerant on a whim without knowing how much is in the system is a crap shoot. Over change will not blow cold, under charge will not blow cold. JEP is exactly correct, pay a few bucks and have it done right and you'll have ice cold A/C.

Edited by white99c2
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Not something to muck about with, if it isn't broke don't fix it. The compressors can make noise dependant on load so it might be normal. Best leave it be.

If you are really concerned have the dealer revisit the issue, there must be some type of warranty on the work.

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