Can you tell me where the ac evaporator drain is on a 2002 mitsubishi montero ltd is? I have moisture dripping from the evaporator case inside the vehicle and suspect external drain is plugged, but cant find the drain. Thanks

It has a filter built into the fuel pump module that is located INSIDE THE TANK. If you had a 2001 Montero Sport Limited, that has a fuel filter at the drivers side ...

Since it was drilled-- verses-- making the proper fix in the past

Your ONLY option-- is completely remove as much as necessary,
until you have found ALL problems & butchered work & reassemble correctly & replace that drilled item

The Evaporator box has a Drain tube, this is blocked and not letting the water drain off ,hence the build up of water in the box which will overflow into the passengers side .
The drain tube needs to be unblocked to let the water drain off.

On a 2002 Mitsubishi Montero LTD, the a/c charging port is between the battery and the windshield. It is the port that has a cap labeled with an "L" (Low Side).

When the a/c is on, "L" (Low Side) gets cold while the "H" (High Side) gets hot.

Make sure you use the Low Side (cold) for adding Freon.

(note: over the counter freon kits should not fit the High Side port anyways)

I take it that condensate from the evaporator is leaking inside on the floor. Could be the drain tube is partially clogged. It is usually located on the fire-wall or down towards the floor pan under the car. It is usually close to where the A/C lines go thru the fire-wall. About 1/2 inch diameter sticking straight out but may have a 90 degree elbow pointing down.
Also, it's been extra hot and humid all over and moisture could be freezing inside the unit when on MAX A/C, then suddenly melting when switched to normal. This opens the outside air door and allows warm/hot air into the unit instead of recirculating the cold air inside the car. The drain may not be able to handle a large, sudden quantity of water.
Perform a "driveway" test. Open the hood, start engine and run the A/C on normal with the windows or doors open. Locate the drain tube by looking for water dripping. Once located twist 2 or 3 pipe cleaners together and verify the tube is clean. Then close the doors/windows and switch to MAX A/C. Check for water dripping. If it stops dripping, water is freezing inside and now you know why!

Center of the firewall just below two transversal hoses.almost inside tranny tunnel..difficult to access and clean.

your a/c evaporator drain is stopped up or blocked off can be seen at firewall area on passenger side looks like a short black hose coming out of firewall and turns down with nothing hooked to it if this gets restricted the blackbox under your dash fills with water and eventually leaks in floor you can try and run small piece of wire up hose to unstop but be careful not to punchure evaporator core

Firewall..right in the center,,just below two tranversal hoses on the firewall. very difficult to see and access....a real piece of japanese engineering...

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.

Have you tried Googling 'Download 2002 Montero Manual'? I did it for my 94 and found a couple of download locations.