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1996 850 - Is it possible to replace the low pressure switch without evacuating the system?

Two years ago - evaporator replace
Today Compressor / Dryer / Orifice replaced
System has been put under vacuum with no know leaks showing
System has had dye put in it and does not appear to be leaking.

Left the shop this afternoon with the new Compressor / Dryer / Orifice installed and the A/C running great. 10 Miles down the road A/C went warm so stopped and found that the compressor was recycling within 2 second intervals. Let it sit for 1 hour and started the car...clutch would not engage...put metal coat hanger on the face of the clutch and it was not energized....so then jumped low pressure switch and compressor kicked in (only jumped it for 5 seconds so no damage).

So my next assumption is that the low pressure switch might be faulty as well and would like to change it myself IF I do not have to evacuate the system?

PS Old Compressor Clutch was bad (10+ mm gap) and leaking.
 

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Yes you can replace it without evacuating the system.
But I would venture to say you have a leak the way you described it happened sounds like a leak and not the low pressure switch.
 
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