The a/c is draining into car

not a wire or coat hanger.
use something softer, to probe the drain hose. bottom up.
or risk damage to the evap core, and $1000+ repair.
use a plastic straw or or even better a bathroom drain cleaner rod.
NO METAL tools. there. 2nd best is wood stick or rod

do not put your body under any car, held up only with jacks.
use Jack stands at least 2, and chock wheels.
be safe or at a tire shop to put it on lift 100% safe. and rod it out.

a tool sold in most stores , and hardware stores.) safe, for car.
this cleans the fungus out of the drain pipe evap, too.

They go down inside front A pillar an inside rear D pillar . To get at them you need to take trim off an the headliner down .
Sunroof Housing Rear Drain Hose Replacement (Impala)
Remove the headliner. Refer to Headlining Trim Panel Replacement in Interior Trim. Remove the rear quarter lower trim panel. Refer to Rear Quarter Lower Trim Panel Replacement in Interior Trim. Disconnect the rear sunroof drain hose from the sunroof module rear spigot. Remove the tape from the rear sunroof drain hose tube.
Disconnect the rear sunroof drain hose from the rear sunroof drain hose tube. Remove the rear sunroof drain hose tube from the upper retainer clip. Remove the rear sunroof drain hose from the rear pillar
The front is simalier .

You may have debris clogging the drain tube.
Look for debris in any depression running below the windshield.
The drain is normally found there.

ok first i would call the shop that just did the work odds are the drain tube is out of position when they reassembled the evap box

Bulletin No.: 03-01-39-011B
Date: November 22, 2005
TECHNICAL
Subject:
Water Leaks Into Passenger Compartment Through HVAC Module Condensate Drain Tube When Parked on Incline/Uphill Position (Install Auxiliary Drain Tube Extension)
Models:
2003-2006 Saturn ION Sedans and Coupes
Supercede:
This bulletin is being revised to include the 2005 and 2006 model years. Please discard Corporate Bulletin Number 03-01-39-011A (Section 01 - HVAC).
Condition
When vehicle is parked on an incline with the front end up during a rainstorm or when driving uphill during a rainstorm, water may leak into the passenger compartment through the condensate drain tube opening of the HVAC module.
Cause
Water may drain out of the cowl drain, then drain down the front of the dash panel in the engine compartment and seep into the HVAC module condensate drain tube opening. The water then collects in the heater core cover and upon acceleration may leak into the passenger compartment through the heater core cover seams.
Correction 1. Open the hood and locate the HVAC module condensate drain tube in the engine compartment on the right side of the dash panel.
Important: During installation of the auxiliary drain tube, do not make contact with the HVAC module foam gasket located at the base of the HVAC module condensate drain tube. If the auxiliary drain tube is pushed on too far and makes contact with the foam gasket, water may leak into the passenger compartment.
2. Slide the auxiliary drain tube onto the HVAC module condensate drain tube and make sure that the auxiliary drain tube is angled downwards after installation.

Pull the carpet down in the passengers foot well and locate the evaporator drain in the housing.

Drill a 1/4 inch hole in the center of the drain tube housing as shown. Clear the drain tube with a wire or suitable tool by inserting it through the hole and into the drain tube.

Insert plug, P/N5255217 into the 1/4 inch hole drilled previously. Verify that the drain is clear by operating the system in the A/C mode and observing that water is draining.

Hope this helps.

Drain tube will be attached to the bottom of the heater housing under the hood on firewall.

your a/c drain tube is blocked you need to locate drain tube and pick out the blockage, drain tube located in engine bay above passenger side chassis leg

Open hood, near center on firewall at back of engine, below and about midway between the AC lines and steering column, a small rubber "L" nipple should be visible, if not, line is draining under dash at the firewall, if it is, it may be clogged again. Find a mechanic that you trust and have them them clean it out for you.

sounds like a stopped up drain tube. probably will need to take to repair facility so they can use compressed air in drain tube to unstop it. Hope this helps.