Can not find low side ac port, only 1 tube - 2002 Chevrolet Tahoe

Verify ambient temperature is above 65 degrees F.

1. Safety> - safety glasses, long sleeves and gloves, (exposure to refrigerant can cause frostbite).

2. Attach hoses to manifold> assembly, (hi, lo, and fill).

3. Remove caps from service ports, (Low press. Larger tube from evaporator to accumulator - passenger side over fender well; High Pressure - smaller tube from evaporator along firewall towards driver's side). Verify service> ports are clean.

4. Attach low press. and high press hoses to proper service ports.

5. Start car>, reset low refrig code, and turn ac on high and fan on high.

6. Read gauges and compare with chart provided with gauge set.

7. If low and high press readings are both low, then system needs recharge.

8. To recharge, attach fill hose to can of R134a and slowly open low press valve>, (NOT HIGH PRESS VALVE), until low press side reads 40 psi.

9. When flow stops and pressures stabilize close valves> and disconnect manifold from service ports and refrigerant can. Replace service port caps.

Usually close to the drier in the tube on the low pressure side. Drier looks like an aluminum cylinder about as big around as a soda can and twice as tall with two aluminum tubes coming out of it. The port has a screw off cap to access.

hmm ..if you are looking for the low side air conditioner port .. then locate the condenser (thats in front of and looks like the radiator) .. you will notice two tubes going to that ..one is large the other small .. the small tube is the high pressure side .. the large tube is the low pressure side ... follow the large tube back until you find a cap that covers the low pressure port .. thats where you would fill with new refregerant (r134a) .. if you buy r134a, you can also get a filler hose and gage.. that hose will only hook up to the low pressure port ..it wont fit the high pressure port ...

NEAR firewall engine compartment TWO aluminum tubes attatched to canister
follow to connector port ONLY one will connect to the AC kit hose
so you try it if it attatches its correct
you do have to unscrew plactic cap on the low side port connector

ENGINE HAS TO BE RUNNING COMPRESSOR NEEDS TO BE ON

LOOK ON THE LOWER BACK SIDE OF ENGINE LOWER FIREWALL.YOU SEE EVAPORATOR LINE WITH A BLUE OR BLACK CAP ON IT.THATS THE CHARGE PORT.

On my 1998 Sienna (when facing the engine), the low port is located on the left side near the back, between fender and the engine. Is is marked with a back cap that has an 'L' on it.

There are two aluminum tubes coming out of the compressor. The high pressure tube goes to the condensor in front of the radiator. The low pressure tube is the other tube, and the port has a black plastic cap over it, on the low pressure tube.

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

There is an AC port near the front of the car under the hood, it's a small silver tube, maybe with a cap. Connect a recharge bottle from an auto parts store on to this port and follow the bottle's dircetions.

the low port is between the engine and the radiator support and the high pressure port is by the cruise controll module