Originally Posted by baloo (Post 7457477)

WHere is the hi/lo pressure sensor located, just in case there already is one installed on this new-to-me car?
Also, can you direct me to more details about a "trinary pressure switch", and where it would go, and how to plumb it in?

Originally Posted by baloo (Post 7457477)

WHere is the hi/lo pressure sensor located, just in case there already is one installed on this new-to-me car?
Also, can you direct me to more details about a "trinary pressure switch", and where it would go, and how to plumb it in?

Originally Posted by SilberUrS6 (Post 7457491)

Before taking any automotive AC advice from wwest, I suggest you CALL Charlie Griffiths and talk to him about what you want and how much it'll cost.

Adding half-brained, poorly-conceived parts to the system might cost you a great deal more than the stuff Griff might sell you.

Originally Posted by kuehl (Post 7457404)

The barrier hoses will typically solve the issue on your year car as far as common leaks with the 911. If you still have an old York compressor the manifolds where the hoses connect leak often. If your condensers are in good shape and your evap, well... there is nothing left to leak. So if you are just looking for 'integrity' (no leaks) and if you still have a York, I'd suggest this as a minimum:

Kuehl 507 Comp Kit,
Complete Barrier hose set, with low-high pressure switch,
New Drier,
R134a conversion kit with ester

something like this 911 Kuehl 507 Compressor kit #3B,.
This kit would be a "turn key" solution for you, other than labor, refrigerant, evac,charge,test.
For a DIY, on the ground, figure 10 hours with common tools. You'll save a few hours
on a lift for the hose R&R procedure.

http://www.griffiths.com/shop/images...ehl507kit3.jpg


However, if you are looking for improved cooling performance, again Read The Mr. Ice Project this will also give you an understanding about your current objectives.

Originally Posted by wwest (Post 7457496)

T
Kuehl (GOD almighty) has a better idea.

Originally Posted by kuehl (Post 7457532)

The topic of the pressure switch is discussed here: Pressure Switch Baloo,
If you are shopping for switches insure you note the cut in and cut out pressures.

Originally Posted by WWest

The hi/lo pressure sensor/switch is most often mounted right at the compressor, on the compressor discharge line/pipe, with wiring directly to the compressor clutch. I would mount the trinary switch in the same place but maybe Kuehl (GOD almighty) has a better idea.

Originally Posted by kuehl (Post 7457532)

The 912/911/930 did not come from the factory with refrigerant pressure switches (aka low high switch). Porsche introduced pressure switches on the 964 in mid 89; although the watercooled group had them back in the late 70's.

The topic of the pressure switch is discussed here: Pressure Switch Baloo,

If you are shopping for switches insure you note the cut in and cut out pressures.

Originally Posted by SilberUrS6 (Post 7401881)

Yeah, we've only been saying this for about ten threads now.

This doofus kills every damn AC thread there is by trying to shout down anyone who actually knows anything about these systems.

Originally Posted by SilberUrS6 (Post 7457491)

Before taking any automotive AC advice from wwest, I suggest you CALL Charlie Griffiths and talk to him about what you want and how much it'll cost.

Adding half-brained, poorly-conceived parts to the system might cost you a great deal more than the stuff Griff might sell you.