Looking at it the one on the right
When the system is low on refrigerant the pressure switch will not allow the compressor to turn on. You may be right on the edge so it will sometimes and other times not. You need to recharge the AC.
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.
right on top of the compressor
You can find the air conditioning low pressure charging port on top of the air conditioning compressor. The low pressure port will be on the right hand side of the air conditioning compressor.
The 1988 Jeep Cherokee air conditioning low pressure port is located on the air conditioning compressor. The low pressure port will be on the right hand side of the compressor.
The 1998 Ford E3 50 low pressure air conditioning port is located on the air conditioning compressor. The low pressure port will be on the right hand side of the compressor.
On the line right at the compressor.
Slide under the front end and look up at the compressor, its right there almost on the compressor.
The oil pressure switch is located on the top of the block right behind the Distrubutor.
On the drivers side lower part of the engine. right by the air compressor.
it's located at the right front end of the engine, right from the thermostate, left from the AC compressor
It is difficult to determine the different pressure ports on your air conditioning compressor without knowing the make and model of the automobile. In most cases the low pressure port is on the right hand side of the air conditioner compressor.