I have a 2003 Mitsubishi Eclipse. The A/C condensates inside the vehicle on the drivers side. I have located the drain tube and it is NOT plugged up. Is there any other reason why it would do this?

under left side of dash

The AC condensate (water/condensation coming off the cold evaporator core) drain is plugged. The drain hole is located inside the AC blower motor housing and drains out at the base of the engine bulkhead on the passenger side under the vehicle.

Sounds like you have a blocked drain hose that drains the water that runs down your windshield when it rains or you get a carwash. Look under the car right in-line with the bottom of the windshield on the passenger side, you should see a little drainage hole. Stick a coat hanger up the tube to unblock the drainage tube.

Look for the drain under the hood ,directly below where the ac lines go into the firewall,clear it out with air pressure.When it is unstopped,the drain will allow a bunch of water to come out quickly,and alot of it.

It’s in the hardest place to reach they could put it. Get under your car and follow the firewall near the center. You'll see a small hose poking out that you can barely reach with an air hose wand. Debris often plug the drain hose. If you hear water sloshing on the passenger side in the dash and/or the passenger side carpet is soaked, blow air through the drain tube to unblock it. Also the grommet around the hose there at the firewall can deteriorate and let condensed water blow back into the driver’s side floor pan. With a lot of effort you can pack silicon sealant around the drain tube at the exiting firewall location and solve that problem. With real effort you can place silicon around it from the interior also. If you don't have a compartment filter or your filter is old and ineffective, you'll be amazed at how much debris sets on your condenser coil down there in the center of the dash (if your airflow is less than you remember and not as cold, the condenser coil is likely covered in debris)...and it's almost impossible to clean it out without disassembling the dash. That's another story on how to fix...

Usually, this is caused by a plugged drain tube from housing that contains the evaporator coil and blower assembly. The condensed water allows mold to grow within the housing as well as road dirt collecting in the tube. Clean the tube--you should get a small rush of water out when the tube is open. Hope this helps!

The evaporator box drain is stopped up.Under hood,under the firewall,right below the ac lines,you will find the drain.Take a small wire,like balin wire and move it in and out of the drain hole to relieve the water,it will pour out pretty good.If this doesn`t work,try compressed air pressure.I hope this helps.

Look down the firewall on the drivers side, right behind the throttle body area.

About 18" down there is the end of the firewall insulation, fold it up and back and behind it you will see the drain tube (about 3/4") sticking through the firewall just above the steering rack.

Sounds like a plugged evaporator drain. Pretty common on these cars as many did not have cabin filters.

Ideally you should pull the evaporator box and clean it out, but for a quick fix you can shoot compressed air into the drain tube to clear the blockage.

The drain tube is in the engine bay, on the firewall just above the steering rack, nearer the drivers side. You will need to pull up on the firewall mat/fabric to see it.

Normal 0 false false false /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} -- open the driver's door
-- locate where the air conditioner blower box is attached to the passenger side of the firewall – see photo #1 – look to the immediate right at the top of the gas pedal arm

-- condensation flows toward the front of the vehicle through the firewall at the leftmost edge of the air conditioner blower box – drain channel
-- open the hood and stand next to the front wheel on the driver's side
-- look down at the firewall over the battery and to the passenger side of the brake master cylinder – see photo #2

-- locate the small diameter metal tubes running horizontally and attached to the engine compartment firewall
-- locate the hole in the engine compartment firewall panel behind the small diameter metal tubes
-- this hole leads to the drain opening in the air conditioner blower box mounted in the passenger compartment
-- follow the brake tubes as they run from under the vehicle and turn toward the front wheel on the driver's side
-- locate the hole in the engine compartment panel behind the brake tubes
-- insert a short length of stiff wire into the hole through the engine compartment panel to unblock the drain hole