The port with the black cap on it is the low side as the red cap is the high side.
below the exhaust header next to the 1st cylinder on the drivers side of the car
Drivers side of engine just under the headers or exhaust manifold, there will be a single wire attached to it running up to the top of the engine and connecting into a wire bundle. Cant miss it.
The low side port for the air conditioner on a 95 Camaro Z28 is located above the condenser. It is the smaller of the hoses next to the firewall.
The 1988 Chevrolet Camaro signal flasher unit is located beneath the drivers side dashboard. The signal flasher unit will be to the right of the brake pedal.
The low side service port on a 1991 Camaro RS is located on the accumulator, which is typically found near the firewall on the passenger side of the engine bay. It is usually a smaller port compared to the high side port, and it may have a blue or black cap. To access it, you'll need to look near the air conditioning hoses connected to the system. Always ensure the system is off and properly depressurized before servicing.
One end at the speedometer head The other at the side of transmission
it is on the drivers side of the firewall little square box near the top of the firewall right side
on the passenger side exhaust pipe. Just under the passenger door location.
passenger side near the fire wall. the smaller line coming out of the expansion valve. has a black cap on it.
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 1999 Chevrolet Camaro OBD 2 port is under driver side dash above accelerator pedal
The low side AC port on a 1988 Cadillac Eldorado is typically located on the suction line of the air conditioning system. You can find it near the firewall, close to the compressor. It is usually a larger fitting compared to the high side port, which is smaller and located on the discharge line. Make sure to check your vehicle's manual for specific diagrams and locations.