What is the aluminum canister next to and connected to the radiator on the driver's side of the radiator. It has aluminum piping to and from the radiator. the canister has a wiring harness connection and a plastic screw cap covering an internal threaded opening. 1999 toyota avalon xls. thanks paul

I think with the patriot it can depend on exactly which model and engine it is. I have described where the most likely places are but I think yours might be Option 1.
It will be in one of three locations. This involves getting under the vehicle **so be careful**.
1. A metal canister with all the pipes going into the top, bolted to the firewall, (Bulkhead), next to the brake servo.
2. A metal canister with the pipes at each end bolted to chassis rail near the fuel tank. These are sometimes tucked into the inside edge of the rail for protection so look across to the far side of the Jeep when looking under the vehicle.
3. A metal canister attached to the side of the fuel tank itself. A similar canister to option 2.

look for a port on the aluminum ac pipes on the driver's side of the engine compartment next to the suspension tower. Port might be on the underside of one of the pipes, marked with L.
Usually on modern cars the ports are pretty fail safe...you can't hook up to the high side with a standard DIY R134A recharger/kit.
Google this:
2007 dodge charger ac recharge connection

The canister is located under the rear driver's side bumper, behind the rear wheel, above the exhaust pipe, next to the fuel tank. The Canister Vent Solenoid is mounted on the canister toward the rear of the car. The Canister Purge Solenoid is mounted in the front passenger side wheel-well, under the large protective plastic above the tire. The system is connected to the intake manifold on the passenger side just on the engine side of the throttle body. The service port is on the passenger side next to the A/C condenser.
Hope this helps you out

I’m happy to help further over the phone at https://www.6ya.com/expert/dennis_7c5f8bf265aab5e9

As of 2000 they put the evap canister underneath by the gas tank also purge solenoid is either mounted on or near it , they changed the design of them also they are no longer round they are kind of rectangular in shape and have clip style quick connects on the hoses.

Look at the lines (aluminum) and the size of the lines. The low pressure line is the bigger of the two where as the smaller line is the high pressure side. Normally the low pressure Schrader Valve is nearer the radiator just up from the canister dryer.

easy job considering ,i done one a while back but the cost of the radiator was astronomical just over 500 euros ,remove the fan on the back of the radiator ,the top piece of metal over the top of the radiator ,and comes out but the problem i had was with the hoses as they have a sort of push in clamp ,also the oil cooler feed pipes from the auto box and the engine oil cooler pipes ,now the engine oil cooler connections were just screw on but the gearbox cooler pipes have a special plastic retaining clips and these broke on me and the only way i could repair them was to buy new ones which come with the whole pipe from the gearbox and they were very expensive indeed ,also their are a few different versions as well ,all this because of a silly plastic clip .Also i had to unbolt the AC radiator from the main radiator as well .but the hardest part was the gearbox cooler pipes

follow the piping from the a/c compressor. The low side has thicker tubes thant he high side.

The low pressure port will have a blue or black cap on it, if not lost at some point.

It may be on the accumulator which looks like a canister connected to
the thicker aluminum lines.

The quick connector hose connects to this port.

Should be on the passenger side near the dryer. The dryer is a round canister near the rear of the engine compartment Good Luck.

Next time you change the fuse,open the hood,make sure vehicle is in PARK if an automatic or in Neutral with the parking brake on,also keep your hands away from the moving belts & radiator as it's hot. Look for a large aluminum A/C compressor,have an assistant turn on & off the A/C and look & listen at the front of the compressor to see if the electric clutch is engaging & dis-engaging. If not, turn off engine and see if electrical lead to it is connected/intact, if it is the clutch could be bad or the compressor locked up. You can check to see if it's working by touching the bare aluminum pipes or lines,if they're cold the unit is working. Check for a little glass window in the black hoses if you see a lot of tiny bubbles or oil streaks there are mechanical issues.

both of the a/c service ports should be located next to the pass. side strut tower. the low side adapter may be hard to find though. If youcan not find it there, it is possible that the low side port could possibly be at the dryer on the drivers side front up beside the condensor

I’m happy to assist further over the phone at https://www.6ya.com/expert/jonathan_3a3c556b4b17d1d2