First timer.....Where is the low pressure line for the a/c system? HELP!

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Hi everyone. I own a 2000 GT with the 3400/V6 motor and I need to charge the system...so I bought some R134. I'm somewhat mechanically inclined, but here's the dilema. I need to charge from the low pressure side. My Haynes says the line would either have a blue or black cap. Well, my question is this- is the low-pressure side the obvious cap in the front of the motor mounted to the radiator fan shroud? Or is it the hard to reach line on the back side of the motor, next to the firewall? Any help would be greatly appreciated. Thanks.
 
Ah = hard bugger

on the bottom middle to passenger side near rad. Mine was right even with the frame and needed a little looking to find it.
 
Come off the back of the A/c compressor........believe it or not, the FAT a/c hose is the low pressure hose. The small one is high pressure. Follow them under the car to find your issue.
 
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