AC Compressor Leaking

Talk and Tech about turbocharged 924/944/968 cars
dr bob
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Tom wrote: Mon Jun 29, 2026 3:32 pm
shft22 wrote: Mon Jun 29, 2026 11:10 am Replaced all four o-rings, did all the good stuff to get the system as it should and she is cooling ok. It was 91F outside when I took this picture.

Thank you all for your help.

IMG_9586.jpeg
Good work! Glad it was that simple!

If you are the type to fixate on things for no practical reason, know that you could get it another 15-20 degrees colder still. :shifty:

Similar compressor in the 928, AC converted to R-134a, cruising west across central California on 46 headed towards the coast. Anti-freeze switch jumpered to support an un-tinted black car in Los Angeles. Cabin setpoint at 72º F, Ambient 85º F, center vent 20º F.

You can get the system really really cold, like freeze your fingers on the steering wheel cold; it's certainly possible with some care and diligence.

Dash temp Small.jpg
Dash temp Small.jpg (60.33 KiB) Viewed 50 times
20 Degree AC Small!.jpg
20 Degree AC Small!.jpg (87.18 KiB) Viewed 50 times
dr bob

1989 928 S4, black with cashmere/black inside
SoCal 928 Group Cofounder
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Former Ex Bend Yacht Club Commodore Emeritus

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Tom
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So if nothing turns into a pumpkin at 20F, why does the system even have the freeze-over switch? Frostbite risk? Now I want to bypass my freez-over switch so I can finally get started on that super-conductor stand-alone system I've been mulling. 8-)

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Belgian951
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Wow this inspires me to get my ac fixed. But I better fix the power steering, new vacuum leak, and bad gas first.
1986 944 Turbo Garnet Rot Metallic

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shft22
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Belgian951 wrote: Tue Jun 30, 2026 3:09 pm Wow this inspires me to get my ac fixed. But I better fix the power steering, new vacuum leak, and bad gas first.

Hey this is a god place for inspiration, so far I have been inspired to do the following;

vacuum leaks -- Disconnected vacuum for fuel tank vent -- Will remove all lines in the future
leaky fuel lines by the tank -- replaced hose with home made AN hoses
radiator fans not working -- Fixed wiring going to resistor and replaced relay
Half shaft -- replaced all four CV joint
transmission drain plug -- old plug had no walls to hold a wrench, replaced with new one with magnet
transmission fluid -- easy after replacing the drain plug
rear shock frozen -- replace with new koni
dash lights -- all LED
Turbo gauge -- Repaired wire at DME
wiper motor -- replaced with new one
intercooler -- had a hole replaced with used good unit
A/C -- replaced controls, compressor seals
Dash cracks -- Installed dash overlay
Seats -- Installed seat covers -- Looking for sports seats at a reasonable price.

But for now since the car A/C is working I will enjoy driving it for a bit to see what other issues come up. Besides is way too hot to work in the garage.

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PSU_Crash
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Tom wrote: Mon Jun 29, 2026 7:03 pm So if nothing turns into a pumpkin at 20F, why does the system even have the freeze-over switch? Frostbite risk? Now I want to bypass my freez-over switch so I can finally get started on that super-conductor stand-alone system I've been mulling. 8-)
Who knew 80's tech would be the key to you taking over the world!? :thumbup:

It definitely looks like my system needs TLC. The coldest I see at the vents is around 50°F
'86 Zermatt Silver 944 N/A :thumbup:
'86 Mitsubishi Starion - Purpose built SM class Autocross car
'87 Chrysler Conquest - Mid LS Swap

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