Hello,
The low side service port is on the low side line near the accumulator. Here is a video that shows how to find the port on any car with diagrams below to show you your truck.
https://youtu.be/ON2dYcmXIAw
Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Tuesday, August 3rd, 2010 AT 3:44 PM