Unclog drain tub - 2011 Buick LaCrosse

It is a known issue and there is a generic video in the link.

https://www.google.com/search?q=unclog+a+ac+drain+on+a+2013+lacrosse

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What type of vehicle?

The way I did it was I used an air hose and blew out the trash

Water leaks are fun to trace out. the drain holes and tubes can be seen with roof open and can be unplugged with compressed air . but usually the headliner is soaked and leaks on to seats the windshield will leak on to passenger floor. remove glove box and check for wetness along "A" pillar.

clogged drain line for the a/c evaporator, use a stiff wire or pipe cleaner to unclog line. Located on passenger side underneath car nest to firewall. Good Luck Tim

all you have to do is blow air into drian or use a hanger to unclog, the drain is located under the van coming out the firewall near the bottom.

I usually unclog them using a puff of compressed air. The crud that plugs them is pretty soft and generally is quite easy to blow out. It may plug up again a time or two until the crud works itself out but usually once the drain is finally clear it will stay open for quite a while.

The best item is weedeater (weedwhacker or whatever you call it) nylon. It is thick enough to push blockage out and flexible to handle any bends. Also check the exit of the drain tube (behind a cover near the front wheel on my GTV6) as an accumulation of mud will prevent the gutter from draining out.

WELL WE TAKE HANGER TO DO IT OR SOME AIR THE TUB IS AT PASSENGER SIDE MOST OF THE TIME SOMTIME EASER TO SEE FROM UNDER CAR HOPE THIS HELPS

you will find a drain hose located on the fire wall 9 times out of 10 build up of debris not hard to unclog at all.