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07-10-2012, 07:54 AM #1
A/C low presusre switch replacement advise.
My A/C started leaking refrigerant at the base of the pressure switch located at the drier/liquid accumulator. I noticed it when the A/C stopped cooling due to ice blockage on both the front and rear evaporators. There was oil around the base connection.
Any advise on replacing this switch without pulling all the R134A from the system? I was thinking of releasing some of the R134A by depressing the schrader valve to lower the system pressure and just unscrew the leaky switch and install the new one. This way, no air will enter the system. Then just recharge the system using a recharge kit from the auto parts store. Any comments?
Thanks.2011 Chevy Silverado LT 4WD 25k miles
2001 Suburban 2WD, 5.3, V8 176k miles
07-10-2012, 12:05 PM #2
I called the dealer today and learned there is an o-ring at the switch. The dealer calls it the a/c cycling switch and not a low pressure switch. Well to me it basically is the same since it senses the low pressure side of the system to cycle the compressor off and on based on the low side pressure.
O-ring PN 3093509
Cycling switch is $46
I will try to tighten it first and see if that fixes the leak. Then replace the switch next.
07-11-2012, 07:14 PM #3
You don't need to drain anything to replace it... Just unscrew it and screw the new one on.... It sits on a schrader valve itself so you won't lose anything during replacement...Joseph
Airforce Veteran (7 years)
NRA Life Member
07-11-2012, 07:16 PM #4
07-21-2012, 10:59 AM #5
07-21-2012, 11:01 AM #6
Oh I did not replace the switch, I just replace the o-ring.
09-05-2012, 07:58 PM #7
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