Question about 2004 Mitsubishi Endeavor

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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

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  • Master
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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.

Posted on Sep 09, 2009

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  • Mitsubishi Master
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Condensation is a normal part of A/C process, in fact the lower humidity is more comforting (over time) than just cold air.
The evaporator (same function as heater core, but for the a/c system) chamber has a drain that most likely has become plugged. Commonly this hose is on the right side of the vehicle.

Posted on Sep 07, 2009

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My 2004 endeavor a/c is draining in the vehicle on the drivers side floor board and i took that side up and was water galore. it looks like it is draining from that black drain from the center but does not...


Same thing happened with my 2004 endeavor. There are 2 fixes (as I understand) for this...the first is to get the drain hose blown out. It can get clogged with gunk, then the resevoir fills up with condensation water and overflow.
The other fix is much more involved and expensive. As I understand it from some research I have done, the drainage hole in the resevoir gets clogged with debris that has made its way down from the grill on the hood just in front of the windshield. There is no filter there (Mitsubishi now has one available), so leaf crud, dust and dirt can get drawn into the resevoir and clog it up.
The permanent fix is to pull the AC to get to the resevoir, pull and clean the resevoir, reinstall everything, then put the filter under the grate.
BTW, when my mechanic blew out my hose and was draining the car, he said there is a hollow space underneath the floorboard and it was holding about 5 gallons of water.
So far, running the AC in southern humidity, it has not backed up in about 4 months. I may have to have it blown out again next spring to avoid the water problem again (this was the second time I had to have the condenser drain line blown out).
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The condensation tube is blocked more then likely, a shop can unclog from underneath for about 30-40$. It is usually located near where the a/c aluminum lines enter the firewall if you want to attempt it yourself. If the line is not blocked then the evap box probally has a crack in it and will need replaced

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2 Answers

Mitsubishi 2004 Endeavor


these are under the vehicle usually parallel to the fire wall and more towards the passengers side tire.

but if it smells like antifreeze then the heater core is leaking

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