Where's the low pressure valve?

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Right on the black thing that has a lot of condensation when your AC is on MAX cold. near the passenger side firewall, it has a black cap.



Make sure the AC is on MAX full throttle when you connect the gauge.
 
The low pressure side, as nobleman said, is on the right hand side of the vehicle. (from the drivers perspective) There should be two different sizes, so you really cant get it wrong.



On a lighter note, on my girlfriends Grand Am, the high and low pressure ports are under the vehicle on the AC compressor. You actually have to put the vehicle on either jack-stands or ramps to charge the system. Talk about a pain in the butt.





Tom
 

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