How to remove vapor canister on 2003 cadillac cts

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EVAP canister ,not purge canister ! Under the vehicle near the gas tank ! Or are you looking for the purge valve ?
Evaporative Emission Canister Replacement
Remove the rear frame. Refer to Rear Frame Replacement .
J 39580 Engine Support Stand
Removal Procedure

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
2. Remove the rear wheels. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
3. Remove the exhaust system. Refer to Exhaust System Replacement in Engine Exhaust.
4. Remove the driveshaft from the differential. Refer to Propeller Shaft Replacement in Propeller Shaft.

Your best bet is to take your vehicle to a repair shop !

Just guessing but trying to help...Your car might be vapor locked..Take off your gas cap... Do you heat KT sucking in air as you take it off...If you do your car will now start...A lot of people at the gas pump will try to get that extra fifty cent in their tank at fill ups..Thats the worst thing you can do. What your doing is putting gas down your gas vapor line...Its meant to burn vapors from your gas tank..When you over fill your gas tank this gas runs down that line into a canister that has charcoal as the filter built inside. Over time your gas will harden the filter to where it becomes clogged..Then as the pressure in your gas tank becomes greater than your fuel pump...Your car will shut off not start back up until the pressure in the tank drops....You can replace this canister... Most are behind your headlights on drivers side..Its that little black box your never did anything..On some vans there underneath...Another thing :is as these canister's go bad your putting all that broke down black charcoal right into your carburetor.. That's those lines thats those lines that are hooked to it at the bottom...So your feeding your car junk...Never over fill your car because in time it will shut off...So just loose the cap and lesson for air sucking in....Try to start it with cap off...More unlikely you have a non stock fuel cap..Either drill tiny hole in the center of cap or replacei it with factory stock...Also some cars have a fuel shut off switch that will shut the gas off in crashes...Sometimes these switches will go bad....they can be reset...Might be in truck under matting....Good luck...Hope all of this helps someone

How to change a fuel filter on a 2003 Cadillac CTS - YouTube

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https://www.youtube.com/watch?v=SRI7SPzVzvk
Jun 2, 2014 - Uploaded by 2LateIWon
How to change a fuel filter on a 2003 Cadillac CTS. ... Lately... my 2007 cadillac CTS (just hit 100,000 miles) tends to shake for may a second if ...

it will look something like this:
and is usually located on the fender well on the engine side toward the front corner of the car (it may be inside the fender itself)
there would be 2-3 large vacuum hoses going to it which will help in finding it.

it "purges" the charcoal canister of fuel vapors. it needs to be fixed.

It is located under the car near the gas tank on a tray with the fuel vapor storage cannister

With filters and attachments to the engine, it is always counter-clockwise, like you are opening a tap or tkaing the lid off a jar........

I hope this helps

Under the car mid way or its in back underneath in front of tank.its a canister shape half the size of a coke can

Most batteries are vented, there are some Gel batteries and sealed batteries on the market that are not vented. Does your existing battery actually have a vent hose on it, that direct the acid vapors down away from the battery? If so, you should get an exact replacement, if not just put a regular battery in the car the top rectangle shaped caps are the vents.