Question about 2004 Mitsubishi Endeavor

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Where bis the a/c drain on the endeavor and can i unplug it myself

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There is no "drain plug" on the a/c
instead there is a drain plug on the HVAC
I am assuming your concern is water inside the car when using the a/c
a clogged drain causes this
the "drain" exits under the hood at the firewall
you can do it yourself, but running a coat hanger through the drain
however, this only pushes the "clog" inside the HVAC which may re-clog the drain someday

the best repair is to clear the drain from the inside which requires a lot more work and some dash dis-assembly

Posted on Aug 25, 2010

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Drain plug on the bottom tank of radiator or remove hose (lower one ).

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Mitsubishi Endeavor 2004. 1. the tail gate and the tail gate glass do not open 2. the AC drains into the driver flooring instead of draining outside to the ground. Why? And where is the output drain...

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Nov 18, 2010 | 2004 Mitsubishi Endeavor

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Can not locate duckbill drain on 05 Endeavor Passenger side of firewall

I assume you are referring to the AC drain.

It is located on the driver side, just toward the center from the gas pedal.

From the outside, you will not be able to see it. It is located in a box in the frame and does not protrude all the way out.
You need to be underneath the vehicle to reach it at all.
On the frame right where the brake line packs turns from horizontal to vertical is a hole roughly 1" in diameter. Facing the vehicle, the drain is in that hole, 1/4" down and 1/2" to the right.
You can feel it if you stick your little finger in the hole so that your finger bends down a little.

If you have an AWD endeavor, this is even more difficult to reach, and should be left to someone with a lift to put the vehicle in the air.

Oct 31, 2009 | 2004 Mitsubishi Endeavor

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Did you check the blower motor before installation?Check for a blown fuse,and a bad relay,also check the blower motor resister.I hope this was some help.

Oct 05, 2009 | 2004 Mitsubishi Endeavor

2 Answers

2004 Endeavor AC condensation gathering in huge puddles on drivers side...can't find obvious point of entry...have pulled back carpet but still no clue

Water puddling on the driver side (ONLY) of Endeavors is evidence of the drain tube foam seal failing. This is very common on Endeavors, and will be more evident on humid days, rainy days, especially with extended driving.
The drain tube for the AC system that extends through the firewall has a small foam ring that seals moisture from running back into the car after it goes out the tube (think of pouring water out of a glass, how some always runs down the side).
High humidity days will cause more condensate than normal and amplify your symptom. Rain will also make it worse, as road water will spit up to the drain hole, as well as normally enter the box through your fresh air vent, creating more water to drain. Driving speed also help force the water past the seal.
The only correct repair is to remove the evaporator box (requires dash removal) and either replace the seal with a new one, or as I prefer replace it with a butyl rubber type substitute that will not degrade like the foam.
You can pack butyl rubber or similar (think windshield packing) around the seal flange on the inside, but it is not an ideal repair.

Sep 06, 2009 | 2004 Mitsubishi Endeavor

1 Answer

2007 Endeavor


This is extremely common on Endeavors, and is caused by a blockage in the drain of the AC system. It can be caused by leaves/debris or insulation foam that has come loose. There is a bulletin to remove the foam and any leaves/debris under warranty (5y/60k) and install a cabin filter to prevent recurrence.

Your previous repair was likely done prior to the cabin filter update to the bulletin, and a cabin filter was not installed.
The updated bulletin that includes the filter was issued September 2008. If your repair was done prior to that, you did not receive the cabin filter, which is why you are backed up again, and you ARE eligible to the have the repair performed again under warranty, this time with a filter. Your dealer will need to contact their DSM for approval to perform the repair again, but they will honor it if you fit those circumstances.

This is not a repair I would recommend taking on yourself. It does require complete removal of the dashboard, all components, and complete ac/heater box (requiring draining of coolant and proper discharge and storage of refrigerant).

Aug 01, 2009 | 2004 Mitsubishi Endeavor

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It should be under your hood, on the firewall. Should be a short black hose there somewhere.

May 17, 2009 | 2004 Mitsubishi Endeavor

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I have a 2006 Mitsubishi Endeavor

There are drain holes, maybe tubes that you can check. Some are in the doors too. Check under the hood and where the wipers are for leaves, etc.

May 01, 2009 | 2006 Mitsubishi Endeavor

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