944S2 AC needs a charge

944 S2 · 09-07-2023, 12:36 PM

Bought some AC Pro to charge my system, but the low pressure fitting by the compressor is too big. Is there an adapter for this?

originalowner · 09-07-2023, 04:03 PM

The high pressure fitting is bigger than the low pressure fitting.

walfreyydo · walfreyydo's Garage

Have you converted to R134a?

944 S2 · 09-08-2023, 04:41 PM

Car has been converted before I bought it. Current configuration: The large fitting (red cap) located by the compressor (Low pressure). The smaller (blue cap) is by the drivers strut. Perhaps they were put on backwards? Is that even possible?

944 S2 · 09-08-2023, 05:05 PM

william_b_noble · william_b_noble's Garage

look in hte manual to confirm which hose is LP and HP, and make sure the fittings are right - I've converted several cars but none are nearby as I write this so I just don't remember. You can get enough R134 into the system via the HP fitting with the car not running that the system will start, and you can hook up your gauges to see which side is which - if it's backwards you will know right away. Note that with 134 you really do need gauges to do this right, it is very hard to just watch the sight glass as you could with R-12

originalowner · 09-09-2023, 06:34 AM

Quote:

Originally Posted by 944 S2

. Perhaps they were put on backwards? Is that even possible?

Yes, it is quite possible. Both fittings on an R-12 system are identical.

944 S2 · 09-09-2023, 12:00 PM

Quote:

Originally Posted by william_b_noble

look in hte manual to confirm which hose is LP and HP, and make sure the fittings are right - I've converted several cars but none are nearby as I write this so I just don't remember. You can get enough R134 into the system via the HP fitting with the car not running that the system will start, and you can hook up your gauges to see which side is which - if it's backwards you will know right away. Note that with 134 you really do need gauges to do this right, it is very hard to just watch the sight glass as you could with R-12

For sure the low pressure is next to the compressor. Are you saying it’s possible to fill with the High pressure side with the car not running?

originalowner · 09-09-2023, 03:43 PM

Buy this:

https://www.amazon.com/dp/B08BF3S33Q

Has everything you need. Put the red connector on the blue hose & vice versa.

Ideally, of course, you would fix the service port screw-up on your car. Might not be easy as the adapters may have been installed with loctite.