There is no low pressure valve - there is a Schrader valve inside the fill fitting but there are only high and low pressure sensors which are used to control the compressor clutch.
SOURCE: location Fuel Tank Pressure Sensor on a 2005 chevy express van
lOOK UNDER THE REAR OF THE VEHICLE ABOVE THE SPARE TIRE ON A CROSSMEMBER BETWEEN THE FRAME RAILS.
SOURCE: AC Low Pressure location on 2004 Chevy Suburban
You find the AC low pressure at the top of the compressor, orientated toward you , facing the front of the
vehicle. You can also follow the compressor line to reach the port.
The valve is covered a plastic cap covering it.
Near the compressor you find two ports, the high port and low port.
To find out which one is the low port, run the air conditioner for a couple of minutes withthe engine on.
Then turn off the care and touch the lines from compressor to the two ports covered with
plastic caps. Only one of the pipes will be cold, the cold line will lead you to the low port.
Regards.
SOURCE: Where is the low pressure line AC for Express 1500
Look for the accumulator(silver can a/c lines go to) on the passenger side of engine area. The Low side charging port cap should be on the side of the accumulator.
SOURCE: Where is the location of the AC low pressure valve for a 2009 F-250 diesel
It's the one the valve screws onto. The only one you can see
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