The low pressure port of the A/C system usually has a blue or black dust cap and is located either on the larger diameter metal tubing typically found between the evaporator and compressor, on the compressor itself, or on the receiver drier (orifice tube systems only). The high pressure service port is found either on the smaller diameter tubing or the compressor and is larger in diameter. Only charge through the low pressure port. There is a web site with a lot of help full information about your auto a/c system check out the link below.
how do you reset the tire pressure warning light on a 2004 pontiac grand prix
You can add Freon to your 2005 Pontiac Grand Prix air conditioning system through the low pressure port. The low pressure port can be found on the air conditioner compressor.
How to reset service light on a 2004 grand am
How to change oil pressure sensor on 3.4 sfi
Above the oil filter.
41 to 47 psi
The low pressure port on the 99 Grand am is on the passenger side. It is right against the firewall.
Begin by removing the wiring harness from your 2000 Pontiac Grand Prix transmission pressure solenoid. Remove the solenoid retaining screws. Reverse the process to install your new transmission pressure solenoid.
above the starter
56-62 psi
the low pressure valve is on the passenger side. follow low pressure line and you will see it
BEHIND THE COMPRESER