Question about 1987 Porsche 944

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1984 944, looking for the low side of the A/C system.

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Should be right on the compressor.
Follow the low side hose back to the compressor.
If it has not been converted from PAG-46 refrigerant you will need to flush and refill.
If it HAS been converted to R-12 or 134a already - you will have to unbolt the compressor to charge - as there isnt enough clearance with the adapter installed to get the coupler on.... and it is charged on the HIGH side in this scenario... since the car is not on.

Evacuate PAG-46

  • Hookup gauge set to high side, low side, and vacuum pump.
  • Open valves and run vacuum pump for 30 minutes, to boil off all moisture.
  • Close valves and make sure vacuum is held. If not, there is a leak.
Then Fill with R-134a

  • Jumper low-pressure cutoff switch (next to left headlight)
  • Hook up R134 can to hoses (purge air from line)
  • This is a good time to add oil, if needed. Pour some in the hose, the R134 will push it into the system.
  • Open high-side (red) valve. This will let some of the R134 go into the system.
  • Once you've got as much as will go in there (putting the can in warm water helps), close the high-side valve.
  • This is very important. If you don't close the high-side valve before you start the car, the can might burst. That would be bad.
  • Start the car and press the a/c switch.
  • Open the low-side valve (the one going to the compressor) and let it s uck in the R134. S uck s uck s uck.
HERE is the TSB for conversion if you're interested.


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Posted on Jun 29, 2009

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