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On a '99 suburban, the low pressure a/c port is on top, towards the back of the compressor, and pointed forward. The high pressure port is there also, just behind it and to the left, pointed straight up.
The low pressure port on any A/C system will be the the line running from the compressor and going into the evaporator in the passengercompartment. The high-pressure port is in the line coming from the condenser in front of the radiator going to the compressor.
It should be about six inches from the compressor. The large line.
Looking at it the one on the right
The Low side line attaches to the compressor on the driver side of compressor. The charging port faced forward. The high pressure port faces up.
look for the port with the black cap on it, it's the low pressure port.
On the ac system, the low pressure port is the smaller port. It will be located on the line coming from the dryer. The low pressure line is the larger line. it will be on it.
low pressure port is on top of the ac compressor
the low pressure port is right on top of the comperssor
The 1997 Volvo 850 low pressure port is located on the air conditioning compressor. The low pressure port will be on the right hand side of the compressor.
If you are referring to the AC low pressure port, you will see two in the engine compartment,the low pressure port is the smaller one. They will both be on silver colored "pipes" and have black caps on them. DO NOT PLAY WITH THE HIGH PRESSURE PORT!
The low pressure port is the one on the accumulator (the canister). The low pressure lines are the bigger lines and the high pressure are the small lines.