It is possible on larger dia pipes but on smaller ones replacement is the ticket.
lateral incisor and first premolar
Open the sunroof and find the four drain holes. Clear any debris. Blow air inside the drain tubes to find out if there is any blockage. Slide the replacement tubing inside the drain hose.
1 unit vertically down for each 12 units lateral.
The pump
The evaporator drain is suppose to drain off the condensation (water). If you plug the drain the water will end up inside the cabin on the floor.
That's possible but difficult and seemingly unnecessary. Why not just lead it's drain to the garden or to perimeter drain.
You drain the water then plaster the walls from inside
Inside the unit under the evaporator coil. The condensate drain line is attached to it.
Usually toilet flange is glued down onto plastic drain pipe. There is a toilet flange that can be glued inside of plastic drain pipe also.
It has to drain the condensate buildup somewhere... Some drain directly into the homes plumbing and only drain outside the home when the inside line has plugged up, like an overflow pipe.
It is on the inside bottom right corner of the radiator. Towards the engine. It will be a plastic drain cock. It is hard to see, but it is there,
Water from my ac is draining in side the floorboard where is the drain hose on a 99 Oldsmobile intrigue