I have a 2002 lincoln navagator , I can not find

the ac hoses are two different diameters. the fattest one is the suction side and the port on it is the recharge fitting. often times the cap on this fitting is baby blue in color

P0775 FORD - Automatic Transmission Pressure Control Solenoid B Malfunction Possible causes - Faulty line pressure solenoid B valve
- Line pressure solenoid B valve harness or connectors
- Line pressure solenoid B valve circuit is open or shorted
- Low transmission fluid level
- Dirty transmission Fluid P0735 FORD - Automatic Transmission Incorrect Fifth Gear Ratio Possible causes - Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit

if high pressure is good and low pressure is low look for restiction on low side
should show up has frosted area (frozen) ristricting the flow of freon
common cause orrifice tube/expansion valve reciver drier accumulator
too much oil added to system

On the low pressure valve located between the compressor and accumulator. The low pressure port has a black or blue cap covering the recharge valve. Don't worry, you can't connect the hose to any other valve port but the low side, the hose end is different from the high side. The high side has a red cap, and is not a recharge port.

In order to charge, you must locate the low pressure valve to install the refrigerant. The low pressure valve is between the compressor and the evaporator. Do not charge on the High Pressure side, The high pressure valve is between the compressor and the condenser. To locate the low pressure valve, follow the line that comes from the compressor and routes toward the firewall. The valve will be somewhere on that line. Do not overcharge. The amount of pressure that is needed on the low pressure side will depend on the ambient outside temperature.

their are two ??one high and one low pressure connector and without the correct machine to re-gas do not attempt to touch anything as its extremely dangerous with high pressures and volatile gas that can freeeze a finger with frostbite in a second

2002 is what I have. should be similar

Service Gauge Port Valves
The high-pressure service gauge port valve is located on the A/C receiver drier manifold and tube assembly.
The low pressure service gauge port valve is located on the manifold of the A/C compressor manifold and tube assembly at the A/C compressor.

Item Part Number Description 1 19860 A/C evaporator core 2 19849 Thermostatic expansion valve 3 19A834 Manifold and tube assembly—thermostatic expansion valve 4 19D850 Manifold and tube assembly—A/C compressor 5 19E762 A/C charge port valve (low side) 6 19E762 A/C pressure relief valve 7 19703 A/C compressor 8 19D594 A/C pressure transducer 9 19712 A/C condenser core 10 19D701 A/C charge port valve (high side) 11 19N585 Manifold and tube assembly—receiver drier 12 19959 Receiver drier 13 19C734 Sensor—evaporator air discharge temperature

It will be the thicker line with a small fitting located on the line itself.

it is the one that is blue in color and has an L on it for low pressure. The vapor line is also called the suction line. If your confused, then choose the larger of the two lines near the accumulator.

look back towards the firewall in the low side AC line, that is the larger of the 2 lines, the charging port is in that low side line.